True. Scientists used the characteristics of life to be able to determine that there is life in earth.
Here are the characteristic of life:
- Living things are composed of cells
- Have different level of organization
- <span>uses energy
- Respond to the environment
- Reproduce,</span>
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.