How does one test for fats and oil? And color
does it give off

paper test

actually this test no need of color observation

Explanation:

take a paper put any fatty substance and cover it with another paper and start rubbing

you can see that the paper is becoming a bit opaque

and this is because of oil or fatty substance in that food item

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

they absorb it i think

not sure

you