The fiddler crab (Uca pugnax) alternates periods of activity with periods of quiescence every 12.4 hours. This pattern is typical of an animal whose activity cycles are synchronized with
A) days shortening and the temperature dropping.
B) neap tides.
C) the full moon.
D) tidal changes.

Question

Quizplus · Accepted Answer

The fiddler crab's activity cycle of 12.4 hours aligns with the tidal changes, as this duration is close to the average time between two high tides or two low tides in most coastal areas, indicating its activities are synchronized with the ebb and flow of tides rather than lunar phases, temperature changes, or the length of days.

The Fiddler Crab (Uca Pugnax) Alternates Periods of Activity with Periods