The organism that was most likely to live at the same time as brachiopods were
Trilobites
Answer:
b and e
Explanation:
i got it correct in usatestprep :)
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
Its skin so it protects the internal organs and systems
