In a river, large boulders are transported by a. solution b. traction c. suspension d. abrasion

Which is it a characteristic of the animal kingdom? a. they include both vertebrates and invertebrates b. their skin is covered with hair or fur c. they are heterotrophs d. they are eukaryotic

All living organisms are composed of a. only one cell. b. at least 100 cells. c. at least three cells. d. one or more cells.

2polnis which of the following is an advantage of an in vitro experiment?me