Answer:
The lymphatic system, or lymphoid system, is an organ system in vertebrates that is part of the immune system, and complementary to the circulatory system. It comprises of a large network of lymphatic vessels, lymph nodes, lymphatic or lymphoid organs, and lymphoid tissues.
Neurons produce an action potential at the same time or none at all
Answer:
eons
Explanation:
these divisions contain anywhere from millions to billions of years
Answer:
That is the smooth endoplasmic reticulum.
Explanation:
You can tell because there are no ribosomes on it.
