Sunlit zone is depth of water exposed to sunlight, trenches is a long narrow ditch.
The main reason FOR exploiting a tropical rainforest would be the products we get out of it -> pretty orchids for our gardens, the products of plants that can be used as food or medice (1/4 of all medicine comes from the rainforests), the exotic animals, the timber than ccan be used for building, etc.
Answer:
D. Gravity.
Explanation:
Gravity is the force that holds objects that attracts objects. Planets are bound to their star because they are attracted to it.
