What happened at the end of the most recent ice age? A. Land bridges became exposed.
B. Sea levels rose over 300 feet.
C. A mass extinction occurred.
D. The Cenozoic era began.

Loss of protected health information collected for research should be directly reported to:

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.

Which of the following do all living things have in common