Simple Invertebrates

Hi it's Holden more invertebrates. If you haven't read my last blog about mollusks a kind of complex invertebrates I'll tell you one more time what an invertebrate is. An invertebrate is a type of animal that that has no backbone. I'm sure glad I have a backbone. But you know we're not talking about any kind of invertebrate.  We're talking about simple invertebrates. The simplest kind of invertebrate is a sponge. Not like Sponge bob he's a house sponge, but I mean sea sponges. You know something really cool if a part of a sponge gets damaged it the cells in it's body will give the sponge a new body.