The plasma membrane performs all of the following functions except
a
facilitating protein synthesis
b
providing a barrier
c
facilitating communication with other cells
d
regulating flow of materials into and out of the cell

the sphincter muscles at the end of the digestive tract is the anus.

well for one plants are always the producer, so a is the answer. a wolf is more of the consumer(predator) and the deer is the prey so i know those two are out of the question. also mushrooms are fungi/fungus so a is the producer.

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.