The natural nutrient enrichment of a shallow lake, estuary, or slow moving stream is calleda. oligotrophyb. spring/fall overturnc. upwellingsd. red tidese. eutrophication

answer:

the patient complains of irritated stomach with gas after eating spicy foods.

explanation:

answer:

i don't believe the ocean is purple, but it might once have been:

as for the sky, according to nasa:

"sunlight reaches earth's atmosphere and is scattered in all directions by all the gases and particles in the air. blue light is scattered more than the other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time."