Assertion: sponge's muscle | /r/HasProperty | multicellular
Facets:
Source sentences:
text: Scientists speculate that sponges emerged, flexing their multicellular muscles*, at least 543 million years ago (*as sponges lack arms, they are sadly ineligible for body building contests).
text: Scientists speculate that sponges emerged, flexing their multicellular muscles*, at least 543 million years ago (*as sponges lack arms, they are sadly ineligible for body building contests).