The answer is A as corals are very delicate to their surroundings
I believe it is the retina that changes shape to focus on distant objects.
All the spheres interact with other spheres. For example, rain (hydrosphere) falls from clouds in the atmosphere to the lithosphere and forms streams and rivers that provide drinking water for wildlife and humans as well as water for plant growth (biosphere).
True.
All living things have cells.
The answer is base pairs.