Question

The opposable big toea) is present in nonhuman primates but not humans, because humans lost this feature. b) is only found in Old World primates. c) is present in all primates. d) is present in nonhuman primates but not humans, because primates evolved this feature.

Answer 1

Answer:

a) is present in honhuman primates but not humans, because humans lost this feature.

Explanation:

The opposable big toe is a trait that helps to primates to climb trees easily. Humans' ancestors started to walk in two legs, this created a needing for better stability, so a fixed toe became to evolve to allow our bipedal locomotion.

Therefore, options b and c are wrong. Option d is wrong too because it implies that the group "primates" is newer than "humans", and in fact, "humans" is part of the group "primates", so this is not the correct answer.