Question

aid in the coordination of the activities of adjacent animal cells. gap (communicating) junctions desmosomes keratin fibers tight junctions plasmodesmata

Explanation:

Gap (communicating) junctions allow for the direct passage of ions and small molecules between adjacent animal cells, facilitating the coordination of their activities. Desmosomes are for cell - cell adhesion. Keratin fibers are part of the cytoskeleton and provide structural support. Tight junctions prevent the leakage between cells. Plasmodesmata are found in plant cells, not animal cells.

Answer:

A. Gap (communicating) junctions