Classify each organism as a carnivore, or herbivore, or an omnivore: Buffalo Bear spider cow

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.

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.

In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?