I think it might be <em>natural disasters.</em>
Answer:
C. Cholesterol
Explanation:
Cholesterol maintains the fluidity of the cell membrane and thereby, regulates its function.
Bile acids are derived from cholesterol which serves as their precursor. For example, Taurocholic acid is a polar derivative of cholesterol. Bile acids serve in the absorption of fatty acids, glycerol, and fat-soluble vitamins as these compounds are non-polar in nature.
Vitamin D is produced when the derivative of cholesterol, 7-dehydrocholesterol undergoes photolysis in skin cells in presence of sunlight.
Cells - tissues-organs-organs system-organisms
The possible answers are
1. Abiotic environmental
2.Biotic environmental
3.Genetic
<span>4.Pathogenic
</span>
The correct answer is 2.
There are two groups of environmental factors, the abiotic factors like temperature and biotic factors that refer to the effects that living beings have on each other.
<span>The flesh-eating bacteria, Vibrio vulnificus is a living organism affecting another organism by attacking its healthy flesh, therefore this effect is classified as a biotic environmental factor.</span>
E. sperm cells, because the process of meiosis is of sexual reproduction so sperm cells and eggs are needed in order for reproduction.