Answer:
A
Explanation:
states that each rock layer is older than the one above it. So, the relative age of the rock or fossil in the rock or fossil in the rock is older if it is farther down in the rock layers.
The part of the atom which is involved in chemical bonding with other atoms is called Valence Electrons. Hope this helps :)
This link should help it has all the information you need...
https://arxiv.org/pdf/1511.08792.pdf
10 percent of energy is passed from one tropic level to the next. While the other 90 percent of energy is lost to heat.
