The cardiovascular system is composed of which of the following?

lungs, blood vessels, and heart

heart, lungs, and brain

heart, blood, and blood vessels

heart, arteries, and veins

What have we learned from fossil evidence about evolution? a) it is an abrupt change. b)the process is observable. c) it takes place during one lifetime only. d)the most complex traits are always selected.

What causes an unsaturated fatty acid to have a different shape than a saturated fatty acid? o a. unsaturated fatty acids have more hydrogen atoms. o b. unsaturated fatty acids have double carbon bonds. o c. unsaturated fatty acids have more nitrogen atoms. o d. unsaturated fatty acids have single carbon bonds.

Photosynthesis converts solar energy into what type of energy?