Answer:
Species eveness and species richness
Explanation:
I took the quiz
A pollutant is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource.
Answer: Sphincter muscles
Explanation:
The circular rings of smooth muscles, that can contract to regulate the movement of the smooth muscles that can contract to regulate the movement of food through the gastrointestinal tract are known as sphincter muscles.
These two layers are outer layer and inner layer. The outer layer is longitudinal and the inner layer is circular. They contract rhythmically to squeeze food.
The best answer to fill in the blank is "multilayered membrane."
