Answer:
In general, these Allee effect mechanisms arise from cooperation or facilitation among individuals in the species. Examples of such cooperative behaviors include better mate finding, environmental conditioning, and group defense against predators.
Explanation:
The water vascular system controls the tube feet hydraulically through a complex of fluid filled canals and reservoirs. Unlike other echinoderms, the madreporite of the holothuroideans is located internally below the pharynx and opens to the coelom instead of the outside world.
