5. compared to atoms of the same element, isotopes have different a. numbers of neutrons. b. numbers of electrons. c. numbers of protons. d. types of subatomic particles.

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry

Which would be the most useful source of evidence to support mcneill's contention?

What is the significance of the protein-lined pits? a. protein attracts other proteins needed for atp synthesis within the cell. b. protein-lined pits are able to transport one molecule at a time down the concentration gradient within the cell. c. the polarity of proteins allows other polar molecules to attach and be transported in the cell by transport channels. d. receptors within the pits allow ligands to fuse and be transported into the cell by endocytosis.