Final answer:
Chimpanzees, gorillas, and humans are genetically similar, sharing more than 97% of their DNA and displaying similarities in many proteins due to the common amino acid sequences.
Step-by-step explanation:
Morphological and molecular evidence suggests that chimpanzees, gorillas, and humans share a high degree of similarity at the genetic level. Gorillas, chimpanzees, and humans have more than 97% of their DNA sequences in common. This genetic similarity translates into many proteins with similar or identical functions because of the shared amino acid sequences.
The biological family Hominidae includes the living genera of chimpanzees, gorillas, humans, and orangutans. Despite some variations in morphology, such as skull shapes and limb lengths that distinguish chimpanzees and humans, they all share a significant portion of their genetic makeup. For example, humans and chimpanzees alone share over 98% identical DNA, highlighting their close evolutionary relationship.
Therefore, the correct answer is d) chimpanzees, gorillas, and humans are similar.