(True or False) A cold front often signals sunny warm weather

This is false. Cold fronts tell us that cooler weather is ahead.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .