Question

read the passage and then answer the question.
the ability to transform light energy into chemical fuel is typically associated with plants and algae. however, in rare cases, animals show this ability, too. several species of sacoglossan sea slugs, for instance, can co - opt the photosynthetic ability of the algae they feed on. the slugs accomplish this by retaining rather than digesting the algae’s chloroplasts, the cell parts primarily responsible for photosynthesis. the chloroplasts continue to photosynthesize even after they are assimilated, a curious phenomenon that forces us to reconsider our assumptions about what animals are capable of.
perhaps even more impressive is the oriental hornet. in 2010, researchers discovered that this hornets yellow stripe contains a certain pigment that transforms light into electrical energy. this could explain why oriental hornets are more active in the middle of the day, when sunlight is the most intense, even though most other hornets are more industrious in the early morning.
like the rest of the animal kingdom, the oriental hornet and sacoglossan sea slug obtain energy from eating. yet they seem to be anomalous in their exceptional ability to use sunlight to create energy. science is still in the early stages of understanding these so - called \solar - powered\ animals.
what is the meaning of anomalous as used in the passage?
adaptable
typical
little known
unusual

Explanation:

The passage states that most animals get energy from eating, but the Oriental hornet and Sacoglossan sea slug can also use sunlight. The word "anomalous" is used to describe their exceptional ability. "Unusual" means not normal or typical, which fits the context as their ability is different from most animals. "Adaptable" means able to adjust, which is not relevant here. "Typical" is the opposite of what is needed. "Little known" means not well - known, but the focus is on their difference, not lack of knowledge.

Answer:

unusual