Dr. Sheffield discovers burrows in a sedimentary rock bed. Which of the following is the most likely conclusion? Dinosaurs once lived in the area. The area was once a forest. The area was once a lake. Worms once lived in the area.

i think it would 12 im not sure bro.

Explanation:

Dr. Sheffield discovers burrows in a sedimentary rock bed. Which of the following is the most likely conclusion? Dinosaurs once lived in the area. The area was once a forest. The area was once a lake. Worms once lived in the area.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.