_____ 1,000 species of finch have been identified.
_____ 1,000 species of finch have been identified.
Explanation
"As many as" is used with countable nouns like species.
It emphasizes a large quantity — suitable here with "1,000 species."
"As many as" is used with countable nouns like species.
It emphasizes a large quantity — suitable here with "1,000 species."