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Relationship among living beings

Organisms are classified into trophic levels according to

Where they live

The source of their nutrients

How much they weigh

Algae are producers in aquatic ecosystems

True

False

Which of the following is a producer?

A cow

A mushroom

An oak tree

Carnivores are primary consumers.

True

False

Decomposition is carried out by

Fungi

Heterotrophic bacteria

Both A and B

Tertiary consumers feed on

Producers

Primary consumers

Secondary consumers

In the food chain: acorns ---> squirrels ---> fox ----> bacteria, the fox is a

Producer

Primary consumer

Secondary consumer

An omnivore is a primary consumer if it eats blackberries but it is a secondary consumer if it eats a rabbit

True

False

Birds make their nests in the branches of the trees where they are protected from the wind and the rain

Commensalism

Parasitism

Predation

The fleas and the lice live in the coat of the animals and they feed on their blood.

Symbiosis

Commensalism

Parasitism

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