Which of the following is NOT true of proteins? a. they form muscle, skin and hair
b. they are found in food
c. they are a main source of energy
d. they are sensitive to pH and temperature

Which statement correctly describes other ways in which nebulae and stars are different? a. a star always has a higher density than a nebula. b. stars can form inside a nebula but a nebula can never be produced by any star. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star. reset submit