Answer: B.
Explanation: Cytosis in this context is the taking in, and releasing of various nutrients, proteins, toxins, etc. in and out of the cell. This is facilitated by the plasma membrane because it's our wall that surrounds the cell deciding who goes in and who goes out.
Answer:
C: Hormones
Explanation:
hormones do not "signal" other cells. I hope this helps :)
A. People can Change the way that the genes flow
Producers because they make their own food such as plants..