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Andrew [12]
3 years ago
10

What is the single greatest environmental cause of human illness?

Biology
1 answer:
bezimeni [28]3 years ago
5 0
Virus infection cells.
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how does codominance at the molecular level help to explain why evolutionary processes haven't resulted in the elimination fo th
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Answer:

here.

Explanation:

Due to the prevalence of malaria in Africa, the allele for sickle cell anemia (HbS) provides a selective advantage. That's why it remains in the population.

A normal African person (HbAHbA), with normal haemoglobin, will not die of anemia, but will die of malaria.

An African person with sickle cell anemia (HbSHbS), with abnormal haemoglobin, will die of anemia.

A heterozygous African person (HbAHbS), with half of his red blood cells (RBCs) being normal and the other half being sickle-shaped, will neither die from anemia, nor malaria since the plasmodium will be incapable of completing its life cycle in the abnormal RBCs.

Thus heterozygous African people will grow, reproduce and pass on the HbS allele to the next generations.

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3 years ago
Parts of the earth that are utilized in the nitrogen cycle
miskamm [114]

Answer:

Atmosphere and geosphere is the part of the earth which is utilized in the nitrogen cycle.

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In nitrogen cycle, the nitrogen which is present in the atmosphere comes down to the earth surface through rainfall. This nitrogen is absorbed by the earth and taken by roots of plants. Some amount of nitrogen is taken by many bacteria such as denitrifying bacteria which converts the soil nitrogen into atmospheric nitrogen and the nitrogen goes again to the atmosphere.

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its is grass. mouse snake

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