Humans and other complex organisms have a hierarchical system of organization. which of the following statements is true regarding this system of organization?
a. atoms are made up of cells
b. organs are made up of organ systems
c. cells are made of tissues
d. organs are made of tissues

Jessica is traveling from miami, florida, to chicago, illinois. using the map, tell one way the land will change during the second half of her trip.

Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?

Which is true concerning the products and reactants of photosynthesis and cellular respiration? a. the products of photosynthesis are sugars and the reactants of cellular respiration are starches. b. the products of photosynthesis are reactants in cellular respiration. c. oxygen is needed for photosynthesis and is given off in cellular respiration.