Which type of skeletons do invertebrates such as crabs have? a. endoskeleton b. exoskeleton c. articulated d. arthropoidal

Which of these is true for bacteria because they are prokaryotic cells? a. they can engulf body cells in order to make memory cells. b. they must invade viruses in order to reproduce. c. they are much larger than eukaryotic body cells. d. they can reproduce on their own outside of other cells.

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes

Which measure of an earthquake depends on how close you are to the focus?