Cell communication occurs among the cells in a multicellular organism. For each of the 3 examples of cell-to-cell communication, describe the communication that occurs and the types of responses that result from this communication

i'd say that the moon rock is about 2.2 billion years old.

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.