The process of maintaining stable conditions inside a cell for an entire organism) is Homeostasis requires
adjustments, because conditions are always changing both inside and
the cell. The membrane is
allowing substances in and out of the cell. The two processes that move molecules are passive and
transport
Passive transport moves molecules
the concentration gradient Examples of this include otrosis
16usion and facilitated fusion (using a
2. Active transport goes
the concentration gradient and requires ATP (cellular energy). An example of this is a sodium-potassium

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.

All eukaryotic cells contain small bodies called

Which of the following statements about protists are true? a.they are typically found in moist environments. b.they are all unicellular. c.they have a nucleus. d.they are all multicellular.