Change the following sentence into the active voice; also revise the sentence for clarity and brevity: The animal numbers for each group are chosen to achieve an adequate sample size to be able to observe a signal for effect in the behavioral tests.

Choose the pronoun that can replace the underlined word(s) in each sentence. mr. ruiz gave the students some homework.answer "them" the check arrived in the mail today.choose the pronoun that can replace the underlined word(s) in each sentence. mr. ruiz gave the students some homework. answer "them" the check arrived in the mail today."it" devon is saving money so that devon can buy a new video game."he" everyone is excited that anyone’s name could be drawn in the raffle. "his or her"