3. explain why multicellularity of an organism requires cell-to-cell communication.

In multicellular organisms (such as yourself), cell-cell signaling allows cells to coordinate their activities, ensuring that tissues, organs, and organ systems function correctly.  I hope this helps.

i think that d. wind is the answer.   i missed the question when i answered a. currents.

b) the inside picture would look at a very high temperature in a very low ph