a scientist working in the middle of a desert found a rock with a fossil of a clam. the scientist knew that clams live in the sea. which could the fossil tell the scientist about the history of the desert​

The fossil could tell the scientist that the dessert was once a sea

It means that that fossil was probably in an ocean or water at the time. So the desert wasn't always a desert. So I agree with the other guy.

idk what the question is about

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.