Please help on this question

The answer is A 1 individuals/ square km

Explanation:

The diagram shows 9 dots (people) inside a square (area) of 3 km by 3 km.

If you find the area of the square (3*3=9 km) you get 9 km. if you divide the amount of people by the area you get 1 person for every square km. Which mean the answer is A.

this is a good question! i'll do some research and come back when i have the answer!

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.