Clouds can begin to form at which point?
a: vapor point
b: humidity point
c: subduction point
d: gradient point
e: dew point

When water freezes, it . contracts expands

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.

There are only about 250,000 known fossil species. true or false