Adenine, thymine, guanine, and cytosine
It could quasatic monumim that comes from the middle of the earth
Isotonic Solutions are the best for animal cells
Endocrine signaling is hormone based signaling that travels through the blood stream. Many of the sensors and integrating sensors of the endocrine system are located in the brain. The brain barrier contributes to endocrine signalling, such that the brain barrier does not factor in with endocrine signalling. The answer is A
