Which of the following is true of dna? a. there are six nitrogenous bases involved. b. cytosine can pair with guanine and adenine. c. there are four nitrogenous bases involved. d. adenine always pairs with guanine.

Which best example best demonstrates the importance of having knowledge of evolutionary relationships? a. illustration of a plant b.organ transplantation between species c. blood donation from a human d. do you need sequence of an insect.

Which organ controls breathing? lungs alveoli heart diaphragm

Label the following as inner or outer planets; a) has 67 moons made mostly of hydrogen and helium b) has rings c)no moons, high volcanic activity d) known as the red planet, has 2 moons e) very thin atmosphere, moons or rings