Which method(s) could you use to distinguish sphingomyelin from phosphatidylcholine by chemical, physical, or enzymatic tests

Several kinds of bears are found on earth. most bears are brown or black, but one type of bear, the polar bear, is white. what process led to this difference in fur color? explain your answer.

How many moles of gas are present if p=11 atm, v=12l, t=185k?

Label a-f based on the table using c for concentrated and d for dilute