Carbon atoms can form many different molecules with many different shapes. Why is this beneficial to living things? Select all correct answers. (More than one answer)

1.Carbon can bond to many different elements.

2.Carbon is always bound to oxygen, which is essential to all living things.

3.Carbon is a central element in most of the molecules that make up living things.

4.Living things require a variety of different molecules to form tissues and cells.

5.Living things require elements that can have four bonds.

Which sequence represents a cross section of the bilayera hydrophilic head, hydrophobic tail, hydrophobic tail, hydrophilic headb hydrophobic tail, hydrophilic head, hydrophobic tail, hydrophilic headc hydrophobic head, hydrophilic tail. hydrophilic tail, hydrophobic headd hydrophilic tail, hydrophobic head, hydrophobic head, hydrophilic tail

Complete the following statements about the functions of the digestive system.carbohydrates and fats are digested in secretes enzymes that aid in the digestion of carbohydrates, fats, and proteins.the secretes bile; bile is stored in undigested food is processed into feces in feces is then stored in until it is eliminated from the body via

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.