Question

fill in the blanks to complete each sentence with the appropriate word.

evolutionary biologists agree that humans are most closely related to the great apes—chimpanzees, orangutans, and gorillas.
nearly 98 percent of human dna matches chimpanzee dna; therefore, these apes are as closely related to humans as zebras are to horses.

Explanation:

For the first blank, "modern" makes sense as we are talking about contemporary humans in the context of evolutionary biology. For the second blank, "modern" is also appropriate as it refers to the current - day humans when comparing the relatedness of apes to humans.

Answer:

modern; modern