1. Exchange materials with its environment efficently
<span>a strong downward current of air from a cumulonimbus cloud, usually associated with intense rain or a thunderstorm.</span>
Answer:
renewable- sunlight. water. wood. nonrewnewable- coal. natural gas. oil .
Explanation
you can plant trees for wood over and over agian, water and sunlight is unlimited
Answer:
Differential reproduction leads to a change in allele frequencies over time. This occurs because of natural selection favoring "successful" individuals that produce more viable offspring.
The sickle-cell allele is maintained in populations exposed to malaria through balancing selection, since heterozygous individuals have protection against the disease.