Which of the following explains darwin’s theory of natural selection? a. more recent species of organisms are changed descendants of earlier species. b. individuals in a population with traits best suited for that environment survive and increase in number. c. present organisms are related to and descended from past organisms.

Name the following: (a) category of pathogen that causes diseases, like common cold and mumps. (b) the microorganism that requires a host to produce.

How do cells grow and reproduce to maintain homeostasis?

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.