Any particular element can always be identified by its?

a. number of electrons.

b. number of protons.

c. number of neutrons.

d. atomic mass.

When the cell concentrates potassium within, against the natural tendency of matter, it is performing a.passive diffusion b.facilitated diffusion c.active transport d.pinocytosis

The pelican's beak is adapted for in .

Use the numbers to place the companies in order of greatest comparative advantage to least comparative advantage in producing large tubes of toothpaste.