Populations can have variety, despite being made up of the same species. If a population has different expressed
traits, this can be due to different inherited alleles. The
frogs below are the same species, but they have different
shades of green based on their inherited alleles. In a
particular environment, lighter green frogs are easier to see
by predators. Explain how natural selection could lead to a
change in allele frequency.

The lighter frogs will be eaten and will not be able to reproduce offspring with the light green trait. Darker green frogs will be able to reproduce more dark green frogs. Eventually most/all frogs will be a darker green because they carry a trait that improves chances of survival.

The influx of warmer water caused an unexpected increase in the metabolic rate of the bluegills, which led to increased physiological stress from limited resource availability.

Explanation:

Bluegill is known as a marine species that live in freshwater. They commonly occur in the deep ponds, lakes and shallow water. They also like to live in aquatic plant species, and near to the shades of trees.

If the plant was releasing more amounts of hot water into the ocean or lake this can cause an unexpected increase for energy used by the bluegills fish per unit of time, and it can cause increased stress from the ability of limited sources.