The hypothesis that the fossil in layer d is younger than the fossil in layer c is supported by the

a) law of gravity.

b) law of relativity.

c) law of superposition.

d) law of thermodynamics.

The oxidizing agent our bodies use to obtain energy from food is oxygen (from the air). if you breathe 15 times a minute (at rest), taking in and exhaling 0.5 l of air with each breath, what volume of air do you breathe each day? air is 21% oxygen by volume. what volume of oxygen do you breathe each day?

The cluster of developing cells from conception until birth is called an

What are levels of ecology and how can we remember them