Two scientists want to determine if dolphins vocally mimic the pitch of our voices in attempt to communicate. The scientists track each time a given dolphin's vocalization matches the pitch of their voices when the scientists are talking, but not directly communication with the dolphin. Then, they record the pitch of another dolphin's vocalization when the scientists are talking directly to the dolphin. Both times the scientists talked for 3 minutes. Identify each of the following parts of this experiment below by matching them together.

What is earths lithospheric plates interact at

To answer this question, researchers studied populations of the dusky salamander (desmognathus ochrophaeus) living on different mountain ranges in the southern appalachian mountains. the researchers tested the reproductive isolation of pairs of salamander populations by leaving one male and one female together and later checking the females for the presence of sperm. four mating combinations were tested for each pair of populations (a and b)—two within the same population (female a with male a and female b with male b) and two between populations (female a with male b and female b with male a). the proportion of successful matings for each mating combination was measured. for example, when all the matings of a particular combination were successful, the researchers gave it a value of 1; when none of the matings were successful, they gave it a value of 0. then the researchers calculated an index of reproductive isolation that ranged from 0 (no isolation) to 2 (full isolation). the reproductive isolation value for two populations is the sum of the proportion of successful matings of each type within populations (aa + bb) minus the sum of the proportion of successful matings of each type between populations (ab + ba). the table provides data for the geographic distances and reproductive isolation values for 27 pairs of dusky salamander populations.

Explain how scientists use geologic time to determine the age of landforms.