A scientist is observing a worm that was found inside a host. The worm that's an outer body that is smooth and soft. Which worm is the scientist least likely to be observing. An earthworm, a pinworm, a hookworm or a tapeworm

The answer is the earthworm

Explanation:

Since the scientist is observing a worm that was found inside a host, and worms are not parasites, nor do they need a host to live. On the contrary, earthworms require living in a moist soil that has organic matter. Earthworms starting the organic particles found in the earth that swallows and then expels them forming a pile of excrement. Earthworms are hermaphroditic, and lay their eggs in moist soil.

your answer is tape worm i know this because tapeworms take over inside of a host and its body is smooth and soft.