there are 2 layers. one for each side. like a sandwich and the layers are the bread. there are two of them so they can hold together the inside :]
there are 2 layers. one for each side. like a sandwich and the layers are the bread. there are two of them so they can hold together the inside :]
A Poriferan typically consists of two cell layers: the outer epidermis and the inner layer of cells called choanocytes. These cells are separated by a gel-like matrix called mesohyl.
forty-six layers
71 microscopic layers
2 layers of lipids.
2 layers
3
there are three
2
Three
Porifera is a phylum, not a kingdom, but I assume you mean the phylum in the kingdom Animalia. According to wikipedia, there are about 5000 different species in Porifera.