What is the second question? If it is in a picture I cannot see it, just comment the question below and I'll see if I can help you :3
The oldest layers are on the bottom thats why they are the oldest. Super position is what it is called if thats what your asking.
Answer:
The Sun accounts for 99.86% of the mass in the solar system, Moon is Earth's only permanent natural satellite, Earth's rotation is gradually slowing.
This is the process of making glucose in plants. Photosynthesis goes through two individual stages:
Stage 1: Light dependent reaction (depends on the presence of light; it can’t happen in the dark)
Stage 2: Light independent (dark reaction) (works in the absence of light, but calling it a dark reaction might be misleading; It can just as well happen in the presence of light).
