Why do o2 and co2 pass through the plasma membrane? a. they are nonpolar and soluble. b. they are facilitated by protein. c. they are "pumped" through. d. they undergo pinocytosis.

One statements is an example of a scientific observation. another statement is an example of a scientific explanation. identify the correct statement for each category to illustrate how scientific explanations are inferred from scientific observations.

Common symptoms of an iron-defiency anemia include muscle weakness shortness of breath and lightheadedness why does iron deficiency causes these symptoms

About __ of the mass of the cell is water