Use the past tense to refer to extinct animals like dinosaurs.

Pterosaurs are extinct, so that means writing:

“Pterosaurs were cold-blooded like modern reptiles.”

Don’t write:

“Pterosaurs are cold-blooded like modern reptiles.”

The sea cow is extinct, so you should also write:

“Kelp was the main food source of the sea cow.”

Don’t write:

“Kelp is the main food source of the sea cow.”

You might think this is a very obscure point, but I fix this sort of error every week when I review student essays. ETS loves to create integrated writing questions about dinosaurs and other ancient animals.

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