If you were a paleontologist who studies fossils of very ancient life forms, where would be the best place to look for very old fossils: on land or in the ocean?

land

Explanation:

The best place to look for old fossils would be on land. This is because millions of years ago about 90% of the Earth was covered in water. As the amount of water kept decreasing and the land increasing, the ancient life forms died and were covered by layers and layers of dirt and minerals creating fossils. Therefore these ancient life forms would found buried deep on land.

velocity and height

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.