Please help asap I’m stuck

Cells are adapted to preform specific functions. which of the following terms refers to this capability?

What are the two causes of density in deep current waters? a. salinity (how much salt) of the water and high temperaturesb. salinity (how much salt) of the water and low temperatures c. oxygen content of the water and high temperatures. d. oxygen content of the water and low temperatures

Select all that apply. careful listening skills include: refraining from interrupting the speaker taking quality notes making an effort to understand maintaining eye contact with the speaker