18. The division of the nucleus is called(A)cytokinesis(B)S phase(C)G1 phase(D)Mitosis

22. Paracrine signaling(A)involves secreting cells acting on nearby target cells by discharging a local regulator into the extracellular fluid.(B)requires nerve cells to release a neurotransmitter into the synapse.(C)occurs only in paracrine yeast cells.(D)has been found in plants but not animals.(E)involves mating factors attaching to target cells and causing production of new paracrine cells.