What is the suns hottest layer

Why is it important that fibrin is insoluble in water?

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Which of these is true for bacteria because they are prokaryotic cells? a. they can engulf body cells in order to make memory cells. b. they must invade viruses in order to reproduce. c. they are much larger than eukaryotic body cells. d. they can reproduce on their own outside of other cells.