With the exception of echinoderms, invertebrates are ; chordates, echinoderms, and vertebrates are soft-bodied; hard-bodied acoelomates; coelomates protostomes; deuterostomes radially symmetrical; bilaterally symmetrical

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million

Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different