Sponges, Cnidarians, Flatworms, and Roundworms are all in which group of animals?
A Mammals
B Vertebrates
C Fish
D Invertebrates
E Others:

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)

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