Two organisms can be considered to be of different species if they -live in two different geographical areas
-cannot mate with each other and produce fertile offspring
-mutate at different rates
-have genes from the same gene pool

Look at the photo of the leaf. which term best describes this leaf?

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.

These are the components of the reservoirs of carbon that are exchanged in our environment.