Answer:
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Explanation:
Answer:
Every living organism is made up of cell or cells. Hence, cells are known to be the basic unit and characteristic of life. All organisms need certain characteristics to survive such as air, energy and water. Oxygen is required by almost every living organism to breathe. Carbon dioxide is essential for plants as they will not be able to carry out photosynthesis without it. Nitrogen is also essential for the building of macromolecules like amino acids by the living cells.
Individuals who are heterozygous for the sickle-cell allele suffer less from the attack of malaria because a small percentage of the red blood cells are sickle-shaped. They are more resistant to malaria than individuals who have two copies of the normal haemoglobin allele. Heterozygous individuals have a better chance of surviving and reproducing in regions where malaria is prevalent since they do not fully contract the disease.