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The presence of a large population of blood worms in a water source indicates what about its pollution levels
a. oxygen is plentiful, organic pollution is nearly absent
b. Organic pollution is very high in oxygen has been depleted
c. Oxygen levels are moderate, organic pollution is present but low
d. organic pollution is moderate but declining. Oxygen levels are just beginning to increase.

Sagot :

Answer:b. Organic pollution is very high and oxygen has been depleted.

Explanation:The presence of a large population of blood worms in a water source typically indicates that:

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