Macrophages are an important part of the immune system. A macrophage released signaling molecules that bound to receptors on the macrophage’s surface. This interaction activated the microphage further and caused it to produce proteins that regulate immune responses. What type of cell communication was involved in the scenario? Explain your answer.

Which of the following is an example of competition a. the leaves of a tree prevent a small shrub from getting sunlight. three species of birds feed a different heights in the same tree. b. three species of birds feed at different heights in the same tree c. zebra and giraffe’s feed on different grassland plants d. cats living in two different homes eat the same brand of cat food.