What is the mass percent composition of an element in a molecule? C. The fractions of the molecule's mass that comes from the elements mass.

The crust of earth may a- continets and ocean floors. b-continents only. c-layers of sedimentary rocks and continents. d-all of the above

If the concentration of phosphate in the cytosol is 2.0 mm and the concentration of phosphate in the surrounding fluid is 0.1 mm, how could the cell increase the concentration of phosphate in the cytosol? a) passive transportb) diffusionc) active transportd) osmosise) facilitated diffusion

Measurements that have similar values are: a. usually accurate b. sometimes accurate c. always accurate d. never accurate