They wondered how the insides of the single-celled organisms compared to the insides of animals. This is what they said: Lanny: “I don’t think they have any of the organs animals have.”
Dorothy: “I think they have a few of the organs most animals have.”
Seamus: “I think they have a few of the organs simple animals, like worms, have.”
Nick: “I think the only organs they have that animals also have are the digestive organs.”
Valynda: “I think the only organs they have that animals also have are the organs they use for breathing.”
Brian: “I think they have all of the organs that most animals have, they are just a lot smaller.”
Which person do you agree with the most?

Explain why you agree with that perosn

Twind is considered to be an abiotic factor because it.?

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.

Jason adds the antibiotic penicillin to a bacterial culture. the bacteria develop genetic modifications in their genome, which gives them resistance to the antibiotic penicillin. what caused this genetic modification?