Assertion: sea urchin | /r/HasProperty | algae
Facets:
Source sentences:
text: Sea urchin classified into omnivora, and their main food are algae, sea weed, sea grass and also another sea particles, such as: dead fish, sponges, or shell.
text: Sea urchins main food is algae but they are scavengers too and some will eat mud or sand, extracting the minute amounts of organic material present.