Answer:
points
Explanation:
List six changes that take place if you smoke.
Answer:
1. Lung damage
2.Heart disease
3.Quitting
4.Vision problems
5.Type 2 diabetes
6.Fertility problems
On Isle Royale, wolves are the main predators of moose. The graph shows the changing wolf and moose populations on the island over a 50-year time span.
The graph plots the populations of moose and wolves in separate lines from 1955 to 2005. The two populations appear to follow opposite trends: when one population is higher, the other population is lower.
Which statement provides the strongest explanation for the trends in the two populations?
A. The populations of predators and prey are limited by abiotic factors only.
B. Predation acts a density-dependent limiting factor on prey, but not on predators.
C. Predation acts as a density-independent limiting factor on predators, but not on prey.
D. Predator-prey relationships act as density-dependent limiting factors on both predators and prey.
Answer:
D
Explanation:
The statement provides the strongest explanation for the trends in the two populations is predator-prey relationships act as density-dependent limiting factors on both predators and prey. Hence option D is correct.
What is predator?Predator is defined as an organism that mostly hunts and consumes other organisms for food. The term "predator" refers to a species that hunts and eats specific other organisms. The animals that predators consume are referred to as prey.
Predator-prey interactions and prey-predator interactions are both crucial density-dependent population controls. The other population's size determines how each population changes in size. When the population density reaches a particular point, a density-dependent limiting factor takes effect. Competition, parasitism, and disease are other instances of density-dependent limiting variables.
Thus, the statement provides the strongest explanation for the trends in the two populations is predator-prey relationships act as density-dependent limiting factors on both predators and prey. Hence option D is correct.
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origin of life of the theory of endosymbiosis
Answer: The theory of endosymbiosis means that eukaryotes(plants and animals) formed from prokaryotes (bacteria and archaeabacteria).
Explanation:
What happens when cerebrum of brain get injured?
explain which direction the molecules will move during diffusion?
Answer:
Up and down
Explanation:
In the process of diffusion, a substance tends to move from an area of high concentration to an area of low concentration until its concentration becomes equal throughout a space.
Answer:
Molecules will move from an area of high concentration to an area with lower concentration.
How can structural changes to DNA effect the structure and function of an organism?
The structural changes to DNA affect the structure and function of an organism, such as in a mutation. When the mutation occurs, the DNA structure changes, which in turn affects gene function.
What effect does mutation have on an organism?When a mutation occurs in the gene segment, then the structure and function of the gene are affected, especially when the exon portion of the gene is affected, and the mutation can be caused either by radiation or any other chemical factors and can cause many types of mutation, such as the nucleotide mutation, base mutation, etc. Apart from that, gene function is also affected when the gene is present in the heterochromatin region.
Hence, structural changes to DNA affect the structure and function of an organism, such as in a mutation. When the mutation occurs, the DNA structure changes, which in turn affects gene function.
Learn more about the mutations in organisms here.
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On your visit to New York City, you and your friend observed that the grey rats (Rattus norvegicus) in the New York subway are considerably larger than a typical West Coast rat. You decided to test whether this difference was genetic or environmental. You obtained a litter of 10 New York rat pups, and a litter of 10 California rat pups. Each of you took 5 pups from each litter and kept them in your room for 3 months, despite your roommates' protests. You fed your rats a balanced diet of dry cat food and fresh fruit and vegetables. Your friend, however, has a soft heart and gave her rats french fries, cheeseburger wraps, hot dogs, and other nostalgic New York fare. At the end of your experiment, you found that the New York and California rats that grew up in your home were exactly the same size. Your friend, however, found that her New York rats were larger than her California rats, and both were larger than your rats. So, is the difference genetic or environmental?
Explain why you concluded this.
a. Genetic
b. Environmental
c. Genotype environment interaction
d. a and b
e. b and c
f. a and c
g. a, b, and c
Answer:
d. a and b
Explanation:
The difference in the size of both rats are due to genetic and environmental because rats of both location increased in size which eats a lot of food as compared to those rats which eats balanced diet. This is due to the environment while on the the other hand, due to difference in genetics, New York rats grew larger than California rats of your friend which eats large number of food. So we can say that both genetic and environmental factors affect the rats size.
True or false Solutions of equal solute concentration are isotonic.
Answer:
Explanation:
now you have two mixtures of different solute concentrations. In comparing two solutions of unequal solute concentration, the solution with the higher solute concentration is hypertonic, and the solution with the lower solute concentration is hypotonic. Solutions of equal solute concentration are isotonic.
The normal pulse rate is ___________. *
1. 70 to 90 per minute
2. 70 to 80 per minute
3. 40 to 70 per minute
4. 70 to 100 per minute
Class 7
C. 70 to 100 per minute
An amoeba ingests large food particles by
Darwin’s explanation for evolution was dependent on which scientific concept?
Answer:
The existence of variations in population.
A simple random sample of 25,000 individuals are surveyed in order to determine the prevalence of individuals that contracted the flu in the past year. Assuming 4,250 individuals indicated they had been diagnosed with the flu at some point in the past year, what is the prevalence of flu for the past year, as indicated from the survey participants?
A. 8.30%
B. 83.0%
C. 17.0%
D. 1.70%
Answer:
C. 17.0%
Explanation:
A random sampling of human populations is done to check the frequency of a particular infection. The proportion of the individuals in the total population that suffered the infection at any time during the year are counted. The proportion of the individuals infected any time during the year is divided by the total number of the individuals surveyed and the percentage is taken to calculate the prevalence of the infection in the sampled population.
Here, the total number of the individuals that were infected with flu in the last year= 4250.
The total number of the checked individuals= 25,000.
So, the proportion of the individuals infected with flu in this population= 4250/25000 x 100= 17%
Answer: It is C. 17.0%
Explanation:
When amino acids are linked together to form chains the molecule formed is called what?
Answer:
Within a protein, multiple amino acids are linked together by peptide bonds, thereby forming a long chain. Peptide bonds are formed by a biochemical reaction that extracts a water molecule as it joins the amino group of one amino acid to the carboxyl group of a neighboring amino acid.
Explanation:
Air pollution is a major health problem caused by the burning of fuels in
a.vehicles.
b.power plants and factories.
c.home furnaces.
d.All of the above
Answer:
D
Explanation:
all of those contribute to air pollution
Answer: D
Explanation:
Which would be the best approach for a student to use in determining
whether an unidentified block is made of metal?
A checking its color
B. determining its mass
C. determining its weight
D. checking its conductivity
1
Which is NOT true of homologous chromosomes? *
(1 Point)
they are identical
they have genes for the same traits
they are in pairs
they have genes that are in the same order
Answer:
Homologous chromosomes are NOT identical.
Explanation:
They contain slight differences in their genetic information, allowing each gamete to have a unique genetic makeup. Consider that the homologous chromosomes of a sexually reproducing organism are originally inherited as two separate sets, one from each parent. Hope this helps :)
Please help whoever’s right will get brainliest
Answer:
1: LAW
2: THEORY
3: THEORY
4: THEORY
Explanation:
A student is investigating how substrate concentration affects the rate of anenzyme-catalyzed reaction. Which threevariables should be kept constant in the setup of thestudent’s investigation? Select all three variablesA. temperature of the reactionB. amount of enzymeC. amount of substrateD. amount of productE. pH of the reaction
Answer:
A. temperature of the reaction
B. amount of enzyme
E. pH of the reaction
Explanation:
Temperature should be kept constant because enzymes operate at different activity rates depending on the temperature. The same goes for the pH as well with different enzymes having different optimal pH levels.
The amount of enzyme should be kept constant as well because different concentrations of enzymes can determine how fast the reaction will occur.
Essentially anything that could affect enzyme activity apart from substrate concentration should be kept constant.
What is the difference between the cell membrane and the cell wall?
Answer:
Cell membrane helps to enclose the cell organelles and cytosol inside a cell. ... A cell wall is a ridgid, protective layer and it covers the cell membrane. For plants, cell walls are mainly made up of cellulose, while a cell wall in bacteria is made up of peptidoglycan,and for fungi it is made up of chitin.
Explanation:
What makes the climate different in the different biomes earth?
Answer:
The animals the different kinds of weather in that biome. Where it is located.
Explanation:
What is physical appearance of traits called?
Answer:
Explanation:
The observable traits expressed by an organism are referred to as its phenotype. An organism's underlying genetic makeup, consisting of both physically visible and non-expressed alleles, is called its genotype.
Five substances that are not pure
of the cell. *
15) DNA is located in the
O Vacuole
O Nucleus
O Cytoplasm
O Membrane
A) Identify a human disorder with developmental limitations that results from changes in chromosome number. Explain how nondisjunction leads to changes in chromosome number.
B) Mutations result in changes to genotype that can result in changes in phenotype. Explain how a mutation causes a change in the genotype of an organism AND may result in a change in the phenotype of an organism.
Answer:A) Patau Syndrome (Trisomy 13) causes intellectual and physical disability, such as underdeveloped eyes, extra fingers/toes, heart defects. Survival beyond the first year is uncommon.
B)
Explanation: Trisomy (or aneuploidy in general) can result when chromosomes to do not separate correctly during mitosis or meiosis. In meiosis, non-separation of a chromosome pair results in a gamete with two copies of the chromosome (and consequently one gamete lacking the chromosome.
At fertilisation the embryonic cell will have three copies of the chromosome (and an embryonic cell with one copy only). These are serious mutations, many of which are non-viable and usually abort spontaneously. Others results in abnormal development and poor survival rates. Only one autosomal trisomy (21) and sex chromosome trisomies (XXX, XXY etc) result in babies that survive into adulthood, albeit with physical and developmental abnormalities (trisomy 21 abd trisomy X). Only one monosomy (XO) is viable.
Other mutations can be less inimical, and may not result in any variation from normal. Mutations in genes coding for proteins or ribosomes may result in potential loss of function. As there are two copies of each gene, the mutated gene is paired with a normal gene and if that is expressed there will be no loss of function.
There are cases where the mutated gene is dominant it will change the phenotype. An example is Marfan Syndrome, an autosomal (chromosome 15) dominant mutation resulting in connective tissue abnormalities and long bones.
An autosomal recessive mutation is not expressed but is carried. If both parents are carriers, the probability of offspring to be doubly recessive and have an altered phenotype is 25%. Cystic fibrosis is an example.
A third possibility is where two alleles are co-dominant. An example of this is sickle cell disease. Consider the three allele pairs SS, Ss and ss.
Those with ss have sickle cell anaemia, a painful and debilitating condition. Those with SS have normal blood cells. Those with Ss have sickle cell trait, which has some mild deficits because a proportion of blood cells are abnormal.
factorize this polynomial function
x³-7x+6
Hint:x³-7x+6=0
Answer:
(x - 1)(x - 2)(x + 3)
Explanation:
f(x)=x3-7x+6 Since (a + b + c + d = 0), then f(1) = 0 --> one factor if (x - 1).
After division -->
f(x)=(x-1)(x2f2+x-6). The trinomial in parentheses can be factored.
Find 2 numbers knowing sum (1) and product (-6). They are -2 and 3.
Therefor, f(x)=(x-1)(x-2)(x+3)
During cytokinesis, the cell membrane ________ until two daughter cells separate completely.
A
expands
B
dissolves
C
pinches in
D
spins around
During photosynthesis, what is the source of the carbon in
the sugar (C6H12O6) that is created?
Answer:
Carbon Dioxide
Explanation:
Please help I’ll give brainliest to whoever’s right
Answer:
This is confusing I think theres missing info. Sorry
Explanation:
Which type of star cluster forms from tightly packed groups of older stars?
Answer:
Which type of star cluster forms from tightly packed groups of older stars?
binary
eclipse
globularopen
Its c
Explanation:
I did the quizz
18) What is the difference between eumelanin and pheomelanin?
Answer:
Eumelanin is black or brown pigment and pheomelanin is red or yellow pigment