Answer:
The nervous system and the endocrine system are both necessary to maintain homeostasis and keep the human body alive.
I would say D it seem to be the likely choice but not a 100%
Answer:
A single phospholipid molecule has a phosphate group on one end, called the “head,” and two side-by-side chains of fatty acids that make up the lipid “tails. ” The phosphate group is negatively charged, making the head polar and hydrophilic, or “water loving.” The phosphate heads are thus attracted to the water.
Explanation: