Tag: Porifera
A Bridge Too Far? In Search of Precambrian Sponges
The most celebrated Precambrian sponge may not be a sponge at all. Watch Darwinians try to coax it into spongehood.
Design in the First Animals
Scientists debate whether ctenophores are the earliest animals to appear in the Cambrian explosion. If so, they arrived with multiple tissues, a nervous system, and a digestive system.