Sedimentary rocks found high in the himalayan mountains contain fossils of clams, sea snails, and other ocean life forms. what does this tell us about the himalayan mountains? a) continental drift resulted in the movement of tectonic plates. b) there was once a large salt water lake on top of the mountains. c) animals, that now live on the mountains, once lived under water. d) the plates that formed these mountains were once under an ocean.

D) The plates that formed these mountains were once under an ocean.

Explanation:

The sentence specifically says fossils of clams, sea snails, and other ocean life forms. First of all, fossils are the preserved remains of these life forms. They lived a long long time ago. Since these are specifically ocean life forms, they would have needed an ocean-like habitat to survive. We know that the Himalayan Mountains were formed when two tectonic plates pushed up against each other so the only true answer is that these plates were once underwater before they created the Mountains.