The and systems communicate to regulate body functioning. a. nervous . . endocrine b. endocrine . . hormone c. neuron . . nervous d. neuron . . hormone a. neural receptor b. mylar sheath c. synapse d. hormones

The nervous and endocrine systems.

I don't see the question for the 2nd part

Nervous and endocrine

Explanation:

The nervous and endocrine system work together to control and regulate the functioning of the body and thus maintain homeostasis. These two systems work together in cooperation to maintain normal functions such as metabolism, maturation, reproduction, etc.These two cooperate mainly via the chemical signals sent by the hypothalamus to the pituitary gland which in response to these chemical signals releases hormones that stimulate the other endocrine glands to secrete their respective hormones and bring appropriate changes in the body. 

Ithink d is the right answer. hope this !

It's because 3 if it was 10 it wouldn't look right do it goes up to 4d