Gametophytes are gamete-producing plants

a haploid
b diploid
c both a and b
d none

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

What is the most appropriate method of gaining weight (muscle mass)

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.