Select the correct statement or statements about compounds and molecules:

a. a compound is made of just one type of element

b. a molecule is two or more atoms bonded together

c. a molecule can be made of one type of element or a mixture of elements.

d. compounds don't act like their elements; compounds

What type of limiting factor affects a large population more then it affects a small population

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.

Differentiate renewable and nonrenewable resources