What is true regarding genes and DNA? A. Each DNA strand contains identical genes.
B. The DNA only transcribes the genes that it needs at specific times
C. Both A and B
D. None of the above

What did the first language sound like

Identify the various levels of atmosphere. troposphere mesosphere exosphere stratosphere thermosphere

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.