Read the section "Cells Make Up Plants And Animals. Select the sentence from the section

that shows why scientists were able to easily

identify cells in plants first.

Due to cell wall.

Explanation:

Scientists were able to easily  identify the cells in plants first as compared to animal cell because the plant cell has cell wall while the animal cell has no cell wall only cell membrane. The structure of plant cell is just like the compartments and the cell wall provides the boundary between two cell which enable the scientist to see the plant cell first.

doctors i believe if i'm wrong sorry

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.