Which of the following can be cofactors?

Which are forms of nitrogen that are usable by humans

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

A. describe the scientific method, using pasteur's swan-necked flask experiment as an example.