Some engineers are creating models of several unicellular organisms. What would all the models have in common? A)They would all be made of many cells with cell walls.
B)They would all have a nucleus
C)They would all have chloroplasts to trap sunlight and create their own food.
D)They would all have one cell with DNA, cytoplasm, and a cell membrane.

it's A hope it helps u a lot ask for anything else

b. lithosphere, asthenosphere, mesosphere   is the answer most likely

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.