Question

complete the sentence with the pronoun that agrees with the word or words in bold. there are thousands of snail species. some of are used throughout the world as a source of food.

Explanation:

The bolded phrase "snail species" is a plural noun phrase. The pronoun needed must be a plural object pronoun to refer to it, and "them" is the correct plural object pronoun that agrees with the plural antecedent.

Answer:

them