Algae are very small _____ that live in the water .They grow fast when the water is ___ and rich

Algae are very small _____ that live in the water .They grow fast when the water is ___ and rich
Algae are very small ____1_ that live in the water .They grow fast when the water is _2__ and rich in chemicals .
1
A trees
B flowers
C grass
D plants
2
A hot
B cold
C dirty
D clean