Eras are divided into O A. epochs and periods
B. Jurassics and periods
C. periods and eons
D. eons and epochs

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

In which case would a scientist choose to use a dissecting microscope rather than a compound microscope

Match the examples to the correct level of organization. 1. system level roses, snakes, puppies 2. organism level roots, stamens, leaves 3. tissue level bone, cartilage, blood 4. organ level heart, veins, arteries