Question

complete the text with the best conjunctive adverb. when hunting prey at night, japanese sea catfish use their sense of smell, their hearing, and their ability to detect vibrations. ___, as scientists have recently discovered, these fish can additionally notice slight chemical changes in the water that indicate the presence of sea worms. however still also

Explanation:

"However" indicates a contrast, which isn't appropriate here. "Still" doesn't fit the context of adding new information. "Also" is used to introduce an additional fact, which is suitable as it adds the discovery of the fish's ability to detect chemical changes.

Answer:

C. Also