Answer:
The answer is below
Explanation:
The half life of a substance is the time required by that substance to reduce to half of its initial value. The half life is calculated using the formula:
[tex]N(t)=N_o(\frac{1}{2} )^\frac{t}{t_\frac{1}{2} } \\\\where\ N(t)=quantity\ of\ substance \ remaining, N_o=initial\ quantity\\of\ substance, t=time\ and \ t_\frac{1}{2}=half\ life\ of\ substance[/tex]
Given that t = 87 years, half life = 29 years, therefore the quantity of strontium-90 left is:
[tex]N(t)=N_o(\frac{1}{2} )^\frac{87}{29} \\\\N(t)=N_o(\frac{1}{2} )^\frac{t}{t_\frac{1}{2} } \\\\N(t)=N_o(\frac{1}{2} )^3\\\\N(t)=\frac{1}{8} N_o[/tex]
That is one-eight of Strontium 90 would be left after 87 years
PLEASE HELP ANSWER THIS
Answer:
I think the answer is A but I also feel like it would be C but I go with A because you can see that it is two or more elements in A but not so much in C
PLEASE HELP WITH BIOLOGY!! WILL GIVE BRAIN!!
Answer:
ok
Explanation:
If you put a plant in the dark for a long time, would it be able to use photosynthesis to get
energy? Why or why not?
Answer:
No i don't think soo
Explanation:
When the plant is in a dark room, it cannot photosynthesize and has not enough food left for the leaves to be healthy because they need light to stay alive or otherwise they will die.
Answer:
no
Explanation:
because plants need sunlight to grow
Which changes would make Earth cooler?
Answer:
Geo engineering
Explanation:
Solar Radiation Management (SRM) involves reflecting more of the Sun's rays away from the planet back into space. This is one way
Mendel worked with pea plants, which are usually (cross-pollinating / self-pollinating). When he transferred pollen from one pea plant to another, he was (cross-pollinating / self-pollinating) the pea plants to (fertilize / segregate) the eggs and form embryos within a seed.
Answer:
1. self-pollinating
2. cross-pollinating
3. fertilize
Explanation:
Gregor Mendel was an Austrian monk regarded as the Father of Genetics due to his immense contribution to discovering the patterns of inheritance. During his lifetime, Mendel worked with garden pea plants (Pisium sativum). One of the notable reasons he worked with peas is their ability to SELF-POLLINATE.
However, Mendel transferred pollen from one pea plant to another in a process called CROSS-POLLINATION. In cross-pollination, the pollen from one plant is transferred to another plant in order to FERTILIZE the egg and form embryos within a seed.
Which of the following terms describes the maintenance of a stable internal environment? A. Homeostasis B. Code of ethics C. Internal response D. Feedback mechanism
Answer:
food and banana bread
Explanation:
bbcbcbcbcbc
Answer:
A Homeostasis
Explanation:
Homeostasis is the maintenance of a stable internal environment, such as hormone level, body temperatures, etc.
Which process has most likely occurred when new traits appear in a species?
Answer:Mutations in these genes can produce new or altered traits, resulting in heritable differences (genetic variation) between organisms. ... Evolution occurs when these heritable differences become more common or rare in a population, either non-randomly through natural selection or randomly through genetic drift.
Explanation:
Choose the BEST EVIDENCE to support the CLAIM: Crater lake was formed when a volcanic cone collapsed and filled with water.
Option A-Sometimes the top of a volcano is blown off or collapses during an eruption, leaving a depression called caldera which filled with rainwater.
What gets passed through the electron transport chain and both photosystems to create energy?
A. electrons
B. oxygen
C. pigments
D. ATP
Answer:
A. electrons
Explanation:
Energy in form of ATP is generated at both cellular respiration and photosynthesis. In cellular respiration, energy (ATP) is synthesized in the mitochondria when ELECTRONS (e-) passes through series of complexes composed of proteins called ELECTRON TRANSPORT CHAIN.
On the other hand, ATP is synthesized when ELECTRONS produced from splitting water i.e photolysis of water, passes through photosystems 1&2 in the chloroplast (thylakoid).
Answer: Electrons
Explanation: The electron transport chain is a series of molecules that accept or donate electrons easily
Divide 144 in the ratio 1:2
Answer:
the answer is between 48 and 96 am not sure
help with all of them please
please help bio 3 question
please help bio 3 question
I gotchu!! ^v^The answer is: "aa" If both letters are lowercase then that means the trait is recessive, and since cystic fibrosis is recessive this is your answer.I apologize if i'm wrong // Your're welcome if i'm correct((-Side Note-)): If you don't mind can you pls mark my answer branliest?
Thank you and i hope you have a great day! ^v^Which of the following is NOT a common adaptation? A Antibiotic Resistance B Longer Beaks C Mimicry D Camofaluge
Answer:you a ?
Explanation:
What vascular tissue transported these carbohydrates?
Answer: the phloem
Explanation: Carbohydrates are mainly transported in the phloem in the form of sucrose. The cell membrane of the sieve cells contains pump proteins that actively convey sucrose into the vascular pathways.
Answer:
What vascular tissue transported these carbohydrates?
The xylem carries water and minerals from the roots, while the phloem carries out the massive transport of water and carbohydrates from the synthesis sites; that is, from the source organs to the dump or demand organs.
Explanation:
quien me la chupa
who sucks me
Answer: ur weird
Explanation: no cap
Which term is defined as the components in an ecosystem, such as soil, air, and sunlight?
biometric
antibiotic
abiotic
biotic
Explanation:
Abiotic factors refer to non-living physical and chemical elements in the ecosystem. Abiotic resources are usually obtained from the lithosphere, atmosphere, and hydrosphere. Examples of abiotic factors are water, air, soil, sunlight, and minerals.
6/2(1+2)=?
6-1 X 0 + 2 / 2 =?
Answer: 9 and 6
Explanation:
6−1x0+
2
2
=6+−1+1
Combine Like Terms:
=6+−1+1
=(6+−1+1)
=6
Which is the best answer to explain how energy levels are affected as energy moves through a food pyramid?
a)Energy increases at the top of the food pyramid because the top predators need more energy
b)Energy increases at the bottom of the food pyramid because consumers pass energy on to the producers
c)Energy decreases at the top of the pyramid because energy is lost at each level of the pyramid
d)Energy decreases at the bottom of the pyramid because producers represent less energy than consumers
Find the Perimeter of the figure below, composed of an isoceles trapezoid and one
semicircle. Rounded to the nearest tenths place
9
6
6
4
Answer:
9 is the correct answer
Explanation:
Eugene and Jenny are selling cookie dough for a school fundraiser. Customers can buy packages
of chocolate chip cookie dough and packages of gingerbread cookie dough. Eugene sold i
package of chocolate chip cookie dough and 10 packages of gingerbread cookie dough for a total
of $174. Jenny sold 4 packages of chocolate chip cookie dough and 2 packages of gingerbread
cookie dough for a total of $50. Find the cost each of one package of chocolate chip cookie
dough and one package of gingerbread cookie dough.
.
.
.
.
.
Eugene and Jenny are selling cookie dough for a school fundraiser. Customers can buy packages
of chocolate chip cookie dough and packages of gingerbread cookie dough. Eugene sold i
package of chocolate chip cookie dough and 10 packages of gingerbread cookie dough for a total
of $174. Jenny sold 4 packages of chocolate chip cookie dough and 2 packages of gingerbread
cookie dough for a total of $50. Find the cost each of one package of chocolate chip cookie
dough and one package of gingerbread cookie dough.
⚠️PLEASE HELP DUE IN 10 MINUTES⚠️
Which of the following is an example of the bottleneck effect?
A. A severe flood kills 98% of a successful cricket population leaving only a very small percentage to rebuild the population.
B. Female peacocks only select males with the most impressive plumes.
C. White peppered mothers are favored and black moths are selected aginst.
D. Seagulls easily move between two different island populations.
E. A small group of frogs moves to an open pond in another ecosystem to start a new population.
Answer:
A. A severe flood kills 98% of a successful cricket population leaving only a very small percentage to rebuild the population.
Explanation:
A population bottleneck or genetic bottleneck is a sharp reduction in the size of a population due to environmental events such as famines, earthquakes, floods, fires, disease, and droughts or human activities such as specicide and human population planning.
Nhich of the following statements is NOT true?
Answer:
A.
Explanation:
A.
How the cancer is diagnosed?
Doctors normally need to do a biopsy to diagnose cancer :)
A biopsy is a procedure in which a doctor will give a sample of client's tissue to a Pathologist who examines it with a microscope and runs tests based on the sample.
Answer:
If you have a symptom or a screening test result that suggests cancer, your doctor must find out whether it is due to cancer or some other cause. The doctor may start by asking about your personal and family medical history and do a physical exam.
Explanation:
hope this helps
have a great day/night
How is the Earth of the 22nd century
different from the Earth of today?
Answer:
Earth in the 22nd ceuntry didn't had Electronics they had weapons, slavery, dynastys, and many more things that barely exist today
can help me this is question
13. If a stream or river stops flowing due to water scarcity, what disease may result from the stagnant water?
malaria
hunger
sickle cell anemia
lung cancer
If a stream or river stops flowing due to water scarcity, the disease that will be caused by the stagnant water is malaria. The correct option is A.
What is malaria?Malaria is a disease that is caused by a protist, called plasmodium. It has four species and all give malaria. It is transmitted by mosquitoes because plasmodium lives in mosquitoes.
Stagnant water is stored water in a place for a very long time. The water of a river or s stream is stopped by dams sometimes. This water is the home to many insects to lay their eggs, like, mosquitoes.
Mosquitoes lay their eggs in water bodies or stop water, so they will lay their eggs in the stagnant water. It will increase the population of mosquitoes and with the increase in mosquitoes, there will be an increase in the cases of malaria.
Thus, the correct option is A. malaria.
To learn more about malaria, refer to the link:
https://brainly.com/question/12968155
#SPJ2
How many genders are there?
Answer:
Nobody really knows how many genders there are.
Explanation:
It widely depends whether you're referring to actual genders or gender identity types. Even then, though, there is not a definite or limited amount of either. For more clarification about the differences...
Gender identity types include: transgender, nonbinary, agender, demigender, etc.
These are not genders because they don't specify what you identify as, they are simply stating that you do not identify with your sex at birth. Don't call these genders, because that would be putting agender and nonbinary people into a binary.
Actual genders include: two-spirit, pangender, polygender, etc.
These are GENDERS rather than gender identity types because they somewhat specify what you identify as.
To say that there are only two genders is incorrect, as gender is a social construct. That does not mean it's useless, it just means that it wasn't constructed correctly because nobody knows for a fact how many genders and gender identity types there are and we probably never will because it's based on one's individual feelings.
Answer:
alot. if you are talking about what you are born with (sex) then there is 3. which is male, female, and intersex. GENDER is completely different. there is too many that i can even say but you can be a girl, a boy, somewhere on the non-binary spectrum (non-binary, demigender, agender, gender fluid, ect), ect.
Explanation:
Water flows through a selectively permeable membrane in a process called __________, but water molecules cross the membrane more easily through channels of transmembrane proteins called __________.
Answer:
Osmosis
Aquaporins
Explanation:
This is because osmosis is the movement of solutes from a region of lower concentration to a region of higher concentration through a permeable membrane.
Aquaporins are lipid bilayer and water pores that serve as channels of transmembrane proteins that allow water to cross the membrane very fast, and they play vital roles red blood cells, plant cells and kidney which help to reduce water lose.
why is it important for plant's to store food?
Answer:
Storing the food helps them to use it in winter and survive because there is very little sunlight available and so they photosynthesis less. ... When they have extra food they store it in their seeds and when the seed grows it gets it's food from the plant until the plant is able to photosynthesis and produce its food.
Answer:
It's important for plants to store food, as food is a source of nutrition, which is necessary for survival. Rather than just eating the food, storing it is a good way to ensure nutrients during droughts or other harsh conditions that make it hard to find food.
Explanation:
which change would usually increase competitions for food among squirrels populations in a certains areas ?
Answer:
growth of birth rate if I'd high
Explanation:
when ever the growth and birth rate become high there is need for more food among squirrels
hi! i’ll give brainliest please help
Answer:
Water flow becomes slower when the river bends.
Explanation:
The sediment cannot be left behind if it goes too fast. So, the river slowed down.
Answer:
I say the answer is A the first one!!
Explanation:
My answer is A the first one!!