I don't understand, what is the question you're supposed to answer?
The correct answer would be D, gravity. As moving water will cause rocks to erode as well as wind, and animal habitation.
He observed 15 different finch species that originated as one ancestral bird. all differing in body shape, beak size, and mating habbits
If there was not a constant Input of energy into the ecosystem then nothing would have the power to do anything and nothing would be alive. the energy starts with the sun, then goes to plants, then animals that eat the plants, and then the animals that eat those animals, Ect. if this chain reaction did not happen then the plants wouldn't have to power to go through photosynthesis and then we would get no energy. the amount of energy lessen with every chain that it goes through, this is why we get more energy eating plants and why they are healthier.
