How do plants and animals depend upon their physical setting and upon one another to live?

Many ways. If there are taller plants associated, then the tall plants could provided shade for a nearby animal, this is especially helpful for a hot day, the animal could suffer a heat stroke. This is one way plants help animals, now, one way animals help plannts, is when an animal dies, it's body decomposes, then providing a type of fertilizer for any nearby plants to grow and become strong and healthy.

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.