Based on the body structures of these animals, which two conclusions are scientifically sound? the skeletal structure of the gorilla and chimpanzee suggest a common evolutionary ancestry. the dog and frog share a closer evolutionary ancestry than the gorilla and chimpanzee. the dog is more closely related to the frog than it is to the chimpanzee. all four organisms share a common vertebrate ancestor.

Option A

Explanation:

Human, chimpanzees and gorillas belong to the same class of biological family known as Hominidae. Hunan is more close to chimpanzees than gorillas. There is difference of only one chromosome between human (23) and gorilla & chimpanzees (24). There are huge morphological similarities among these three species such as the number of arm bone, leg bones and the skull in humans, chimpanzees and gorillas are similar in number and structure.

Hence, option A is correct