How will hormone travel to its target organs? A. Carried by neurons

B. Sweat glands

C. Carried by the blood

D. Carried in the digestive tract

Acell in the human nervous system whose primary function is to form myelin and the blood-brain barrier, respond to injury, remove debris, and enhance learning and memory is called a(n) cell.

What element is able to combine with itself and hydrogen to form large molecules ?

What function does the limb sever in each animal? how are the limb bones of the four animals similar? based on these similarities what can be inferred about the evolution of the four animals.