We can combine the two sentences by making the second sentence an adjective clause as "Forests cover 31% of Ohio, which has at least 99 tree species."
We can define an adjective clause as having the following characteristics:
In order to combine the sentences provided in the question and make the second sentence an adjective clause, we simply replace the noun "Ohio" with a relative pronoun. Thus:
With the information above in mind, we can conclude that the answer provided above is correct.
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