High quality hybrid varieties provide high yield, then what is the need of native varieties? Record your response to this statement.

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.

what bodys are there orbiting?

your answer would be a, maximum exploitation of resources.