Answer:
i think Decaying plant matter is answer
In my opinion, it would be C!
please let me know if this is correct!
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.
Lipids have no polymers.
A lipid is formed when a glyceral combines with one or more fatty acids.
