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Complete the sentence. Use either passive or active voice.

The first fish ........................... (appear) on Earth about 500 million years ago. Up till now, more than 20,000 kinds of fish ......................... (name) and ............................. (describe) by scientists. New species ............................ (discover) every year, so the total increases continually.

Respuesta :

Answer:

4r

Explanation:

Answer:

appeared, were named, described, are discovered.

Explanation:

The first fish -appeared- on Earth about 500 million years ago. Up till now, more than 20,000 kinds of fish -were named- and -described- by scientists. New species -are discovered- every year, so the total increases continually.

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