Photsynthesis to make food
Answer:
C
Explanation:
The principle of superposition states that the oldest sedimentary rock units are at the bottom, and the youngest are at the top. Based on this, layer C is oldest, followed by B and A. So the full sequence of events is as follows: Layer C formed.
Magnesium Phosphate is the answer
1. mother to fetus 2. through exposure to the antigen (virus, toxins, or cancer cells).
