Evolution of Porifera

•Sponges are really just a bunch of specialized cells working together to help the entire organism survive.
•Sponges do not have nervous systems, so they don't react to the world around them.
•Fossil steroids found underground in Oman show that early Earth was the scene of a sea sponge heyday more than 635 million years ago.
•The first animals to live on Earth may have oxygenated the planet's oceans.