Which of the following lists the steps of technological development in the
correct order, from first to most recent?

it would be the percentage of food eaten by the flock

i remember doing this lab

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.