A-Level Environmental Science exam question:

Since the 1950s, the exploitation of the rare-earth elements has increased from a few tonnes per year to over 150 000t per year. They are used in a wide range of applications, including new developments in transport, electronics and healthcare.
Although the main metals used following the industrial revolution are still important, economic development since the mid 1900s has involved the use of relatively small quantities of a much wider range of metals.
Many rare-earth elements have a relatively high mean crustal abundance, but they rarely occur in locally concentrated deposits.
Figure 1.1 shows details of the reserves and production of rare-earth elements in seven countries.
Use the data in figure 1b to calculate the missing values

Answer:

one sperm fertilizes the egg cell, forming a diploid zygote

Explanation:

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In angiosperm double fertilization, one sperm nucleus fertilizes the egg to form the diploid zygote, and a second sperm nucleus fuses with the two nuclei in the central cell of the embryo sac.

The egg is the female gamete in an angiosperm. It is a haploid cell that contains one set of chromosomes. The zygote is the fertilized egg. It is a diploid cell that contains two sets of chromosomes. The zygote will eventually develop into an embryo. The central cell is a cell in the embryo sac that contains two haploid nuclei.

Double fertilization is a unique feature of angiosperms. It is a type of fertilization in which two sperm nuclei fertilize two different cells in the embryo sac. The first sperm nucleus fertilizes the egg to form the zygote. The second sperm nucleus fuses with the two nuclei in the central cell to form a triploid cell. This triploid cell will eventually develop into the endosperm, which is a food reserve for the developing embryo.

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If two alleles of different genes are in close proximity with each other on the

same chromosome, they would most likely link during gamete production.

Meiosis is the type of cell division that takes place in gamete( sperm and egg cells) production. The alleles are responsible for the phenotype of an

organism.

When alleles are in close contact on the same chromosome they are most

likely to be linked together and transmitted as a single unit . These brings

about variation between parents and daughter cells in some features such

as color, height etc

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Climate change has a great effect on the habitat distribution of Baltimore orioles bird.

Climate change will adversely affected the habitat distribution of Baltimore orioles because climate change causes heat waves, wildfires and intense downpours which is harmful for Baltimore orioles.

The climate changes will limit the populations of ranges of Baltimore oriole as well as changes the habitat. These Baltimore orioles moved to other places where the climate is favourable so we can conclude that climate change has a great effect on the habitat distribution of Baltimore orioles bird.

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Answer:

4.Red

5. gamma waves

5. Gamma waves

Explanation:

if you look at the visible light they label all the colors for you red is at the end closest to increasing wavelength

Answer:

That is causing global warming. It is causing the sea level to rise and it is also making hurricane stronger.

Explanation:

Answer:

2. Cell wall

Explanation:

animals and some other organisms don't have cell walls, unlike plants (which has cellulose cell walls), bacteria (which has murein or peptidoglycan cell walls), etc.

Answer:

respiration

Explanation:

Answer:

A.) Low-pressure systems are usually associated with clouds and precipitation that minimize temperature changes throughout the day

B.) The slightly inward moving air in low pressure causes air to converge and since it can’t move downward because of the surface, the air is forced upward, leading to condensation and precipitation

Explanation:

Answer:

There are five vestibular receptor organs in the inner ear: the utricle, the saccule, and three semicircular canals.

Explanation:

Animals do not make their own food.

Answer:

Altogether, this recipe takes about five days and is done in three stages: Soaking the beans for 1-2 days. Cooking the beans until soft, about 1-2 hours. Mixing with seasoning and lacto-bacilli and allowing to ferment for 3 more days.

Modern Biotechnology is helpful in enhancing taste, yield, shell life and nutritive values.

Explanation:

I HOPE ITS HELP YOU

Foods or beverages created through managed microbial growth and enzymatic conversion of food components are referred to as fermented foods.

Biotechnology is the application of biology to the problem-solving and product-making processes. The most well-known application of biotechnology is the use of genetic engineering to produce therapeutic proteins and other medications.

Because the production of antimicrobial metabolites (such as organic acids, ethanol, and bacteriocins) lowers the danger of contamination with pathogenic bacteria, food fermentation has historically been used as a preservation technique.

Therefore, Foods or beverages created through managed microbial growth and enzymatic conversion of food components are referred to as fermented foods.

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Answer:

population is the best answer

A possible source of additional salt in the stream is the influence of the ocean upstream.

The map shows the course of the Mississippi River through the states of Minnesota, Wisconsin, Iowa, Illinois, and Missouri and its mouth in the Ocean.

According to this information, the salinity detected in South Dakota of the Mississippi River can be caused by the influence of the salty water of the Ocean against the current of the river.

Note: This question is incomplete because the map is missing. Here is the map.

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Answer: C. Nearby Franking

Explanation: Someone in the comments was helpful enough to say it but couldn't post it so yea, just passing it on but its right so thanks to them

Answer:

enzymes are biological catalysts which speed up the rate of biochemical reactions

Increasing the concentration of enzymes would speed up the rate of photosynthesis and respiration due to the fact that the enzyme substrate complex can occur on a much larger scale i.e. more enzymes would be able to bind with more substrates producing more Oxygen in the case of photosynthesis and more ATP in respiration

Decreasing the concentration of enzymes would have the opposite effects

The differences in enzyme concentrations affect rates of photosynthesis and respiration are process accelerators.

Enzymes such as Rubisco, sedoheptulose-1,7-bisphosphatase, aldolase and transketolase dominate the control of photosynthesis. Reductive fixation of CO2 requires ATP and NADPH and their concentrations in the stroma increase when chloroplasts are illuminated.

The chemical reactions involved in photosynthesis are controlled by enzymes . The temperature increases the number of collisions increases, therefore the rate of photosynthesis increases. However, at high temperatures, enzymes are denatured and this will decrease the rate of photosynthesis.

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Explanation:

Explanation: The electron transport chain generates the most ATP out of all three major phases of cellular respiration. Glycolysis produces a net of 2 ATP per molecule of glucose.

Answer:

a

Explanation:

Answer:

b. is correct Epiglottis

Explanation: post protected

Answer:

volcanic eruptions

Explanation:

Answer:

Aristotle classified animals based on where they lived, while Linnaeus instead used an animal's morphology, evidence from both fossil records and living organisms.

Answer:

50%

Explanation:

To solve this, we'd need to use a Punnett square.  Since the mother has a heterozygous genotype and has an A-blood phenotype, we know that she is AO and the father is AB.

          A             B

A       AA           AB

O      AO           BO

According to this, the four possible blood types, with equal probability are: AA, AB, AO, and BO.  Both AA and AO genes will result in type-A blood, since A is dominant over O.  Therefore, there is a 2 in 4 (or 1 in 2, or 50%) chance of the child having type-A blood.

Answer:Fibrocartilage

Explanation:

Answer: No

According to BBC, Human activities such as harvesting plants and hunting animals can unbalance the flows and cycles within those [SMALL SCALE ECOSYSTEMS ]ecosystems. Tree-felling may lead to soil erosion and a loss of habitat. Lack of shade and moisture in the soil can result in desertification.

According to National Geographic, Humans impact the physical environment in many ways: overpopulation, pollution, burning fossil fuels, and deforestation. Changes like these have triggered climate change, soil erosion, poor air quality, and undrinkable water.

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Answer:

Enzymes are important because they make the chemical reactions in cells happen quickly.

Enzymes, by speeding up biological reactions, ensure that all necessary activities in a cell can take place simultaneously and prevent one particular activity from overtaking the entire cell or organism. This is possible because enzymes allow chemicals to react more specifically with only certain substances rather than reacting indiscriminately with any number of different substances within cells.

The most famous example of this enzyme effect is when stomach acid reacts with pepsin that turns food into a liquid. The body then uses this liquid for absorption through the intestines where nutrients are then used throughout the body. It's important for people to have enough enzymes in order to digest their food fully however if

Explanation:

Answer:

d generate offspring that carry parental genes

OA

Carbohydrates. Carbohydrates are the third major component of plasma membranes. In general, they are found on the outside surface of cells and are bound either to proteins (forming glycoproteins) or to lipids (forming glycolipids).

Answer:

water then carbon diaxide  and oxygen

Explanation:

Answer:

Light energy + Water + Carbon Dioxide to leaf to sugar + Oxygen

Explanation:

This is called photosynthesis. Hope it helps

Answer:

b is the answer predator

Answer:

A. Somatic cell

Have a good day!!!

Explanation:

Answer:

I think B is right It can be wrong too

Answer: (D) Inherited traits influence more than one gene.

Explanation: