What is the best estimate for how long there has been life on earth?

What volume of a 0.25 m solution can be made using 0.55 moles of ca(oh)2

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.

What tool do geneticists use to predict the outcome of genetic crosses? a.karyotype b.punnett square c.centrifuge