Question

select the pronoun whose antecedent is a flea. a flea can consume fifteen times its body weight in blood each day.

Explanation:

To determine the pronoun with antecedent "a flea", we analyze the sentence "A flea can consume fifteen times its body weight in blood each day." The pronoun "its" refers back to the noun "a flea" (the antecedent), as "its" is used to show possession related to the flea's body weight.

Answer:

its