[neilep (OP)]

Dear Klevur peeps,


Some animals live in a cave all their life or others may live at the bottom of the sea never ever seeing sunlight.

Do they still follow a 24 hour cycle ? sleeping ? do they follow seasons ?




whajafink ?






Neil
xxxx

[Halc]

They probably do not follow a 24 hour cycle, but seasonal is something else. There are regular seasonal changes to say the water levels in caves and other currents and temperatures. OK, the sea bottom is perhaps a fixed temperature of about 4°C, and do those creatures really care about seasonal fluctuations in currents?

Any of them might have seasonal access to food that drifts in from outside or from the surface of the sea.