Eutrophication because excessive richness of nutrients in a lake or other body of water, frequently due to runoff from land with causes a dense growth of plant life and death of animals from lack of oxygen
Question 1) Photesphere Question 2) core Question 3) The suns gravity keeps them in place Question 4) True I'm not 100% about question 1 it's either photesphere or core, but I think Photesphere is correct
