Question

long thought to be sessile (immobile), adult chelonibia testudinaria, barnacles that adhere to sea turtle shells, have been observed to shift slightly in position over time—a phenomenon that has been attributed to the barnacles passive displacement by water currents._____ a research team found that adult c. testudinaria moved toward the heads of their sea turtle hosts and thus against the prevailing water flow, behavior consistent with self - initiated locomotion. which choice completes the text with the most logical transition? a) confirming this hypothesis, b) contrary to this phenomenon, c) drawing a similar conclusion, d) undermining this explanation,

Explanation:

The initial idea was that barnacles' movement was due to water - current displacement. But the new finding shows they move against the water flow, which goes against the previous explanation.

Answer:

D. Undermining this explanation