What observations and inferences from fossils might have been used to build the computer model

when scientists figure out what is in a fossil dinosaur dropping, they can then make inferences about what the dinosaur ate when it was alive. They are not observing the dinosaur eating—they are using evidence to make an inference.

Explanation: do you need to know?

answer; ////increased water pollution; ///////////////////////

your answer is "the 1950's"