Studies have shown that if rhesus monkeys are reared in isolation, their adult sexual behavior is severely disturbed, to the point where they may be incapable of reproducing. However, if mice are reared in isolation, their adult sexual behavior will nonetheless be normal. Which of the following statements best explains the difference in outcomes?
1) For all higher species, sexual activity is limited to a natural mechanism of reflexes and hormones.
2) Sexual activity is purely a function of biology in monkeys.
3) Environmental influences play a stronger role in sexuality in higher species than in lower ones.
4) Monkeys are incapable of learning through observing their environment.