Which statements about freshwater sources are true? Check all that apply.
Only
about 3 percent of Earth's water is
fresh water.
Most of the fresh water on Earth is groundwater.
About 75 percent of the fresh water on
Earth IS frozen In ice sheets.
E The largest source
of usable fresh water IS aroundwater
1D More fresh water iS In the atmosphere
than in rivers and lakes.

Which process of living things produces water that enters the water cycle

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.

When the cell concentrates potassium within, against the natural tendency of matter, it is performing a. passive diffusion b. facilitated diffusion c. active transport d. pinocytosis