Describe the nitrogen and water cycle and the water cycle

Decomposition of biological waste by microbes can return nitrogen to the atmosphere. The water cycle is the process by which water travels in a sequence from the air (condensation) to the earth (precipitation) and returns to the atmosphere (evaporation). It is also referred to as the hydrologic cycle.

Explanation:

Normal genotype: AA
sickle-cell genotype: aa   ( It's a recessive trait)
heterozygote's genotype: Aa

In  the Hardy-Weinberg Equilibrium equation, the recessive allele is represented by q².
The proportion of the allele for the sickle cell is 0.10, so we only need to do the square rote to determine the frequency of the allele: √0.10
0,32