There are a few different types of cell-cell interactions. Some of these interactions are meant for big molecules that enter and exit the cell called, endocytosis (entering the cell) and exocytosis (exiting the cell). For smaller particles like amino acids, water, ions and other solutes there are different types of direct contact between the cells called gap junctions.
Answer:
is a process of photosynthesis
Answer: A) they use calories from their food to make heat
Explanation: you eat to get energy, and you use that energy to make heat
and its the only one that makes sense
process of elimination, really :)
