Why are all the people on earth members of t he same biological species?

a. all people have the same genetic makeup.

b. all people originated from the continent of africa.

c. all people have adaptations that allow them to live anywhere on earth.

d. all people can mate with one another and have children.

Theories basic to all of the life sciences include the germ theory of disease. theory of evolution by natural selection. o two of these answers are correct none of these answers are correct o cell theory.

Drag each tile to the correct box. arrange the layers and faults from oldest to youngest.

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.