Assertion: sponge's canal | /r/HasProperty | central
Facets:
Source sentences:
text: Asexual reproduction occurs when favorable environmental conditions deteriorate and includes both regeneration (regenerating from fragments), budding (groups of cells differentiate into small sponges that are then released externally or expelled through the central canal (oscula)), or the formation of gemmules (“survival pods” of unspecialized cells that remain dormant until conditions improve and then either form completely new sponges or re-colonize the skeletons of their parents).