The plants were providing the necessary oxygen for the animals to breathe and the animals were serving as an aide in photosynthesis for the plants by producing carbon dioxide.
The answer would be D, because that is the only logical one, and selling 15 cups is not a hypothesis, it is a fact.
D is the one hypothesizing that he will make a profit.
Hope this helps and have a nice day:)
When a chlorophyll molecule absorbs light, the process of photosynthesis, or the transfer of light into sugar, begins. ... For each photon of light that enters and excites a chlorophyll molecule, one electron is released from the reaction center of Photosystem II. So it passes to the reaction center where energy excited pair of electrons, which "jump" to electron acceptor.
