A scientist finds a new organism. It gets energy by absorbing nutrients from its surroundings. It is unicellular and it uses a tail-like structure to move around. Is this new organism a protist or a fungus?

Eating particles through endocytosis.

Absorbing energy from their surroundings.~~~~~

Creating their own energy.

By eating larger organisms

can someone please check my answer

The alternatives do not answer your question.

Definitely not a fungus.

Is it correct?

Based on the given information, the new organism you described is most likely a protist. Protists are unicellular organisms that can obtain energy either by absorbing nutrients from their surroundings or by creating their own energy through photosynthesis. Fungi, on the other hand, are multicellular organisms and typically obtain energy by decomposing organic matter or absorbing nutrients from their surroundings. Since the organism in question is described as unicellular and obtaining energy through nutrient absorption, it aligns more with the characteristics of a protist rather than a fungus.