Biology

The correct answer is: C.A worm living in a cow's intestine.

This is an example of symbiosis because the worm and the cow are in a close, long-term biological relationship. In this case, the type of symbiosis would be parasitism, as the worm benefits by living in the cow's intestine and possibly feeding on the cow’s nutrients, while the cow is harmed by this relationship (its nutrients are being consumed by the worm).

Why the other options don't apply:

A.A mother bear taking care of her cub: This is an example of parental care, not symbiosis. Symbiosis typically refers to a close biological relationship between two different species, whereas parental care is between individuals of the same species.

B.A ...