Fossil records clearly show cubozoans dating back to about 350 million years ago. Most scientists think that cnidarians showed up perhaps 700 million years ago since their gelatinous bodies don't lend themselves well to fossilization. That is quite an ancient history for an animal that has the most complicated and sophisticated single cell now in existence, the nematocyte. That cell defines the phylum and can explosively launch a tubule in less than 3ms at an acceleration of about 40,000 times that of gravity, some of which can penetrate almost a millimeter (hundreds of times the length of the nematocyte).
The evolutionary significance of Cnidarians is that they were the first animals to move. As for Porifera, they were the first animals on Earth.
They are in Porifera. Porifera is divided into three classes- Calcispongaie, Hylospongaie and the largest of all, Demospongaie, to which redbeard sponges belong to. Poriferans are multi-cellular organisms which remain attached to the bottom and have spicules. Porifera. The sponge is actually an animal. One of the very first divergences from within the group.
yes
Phylum Chordata first appeared over 500 million years ago during the Cambrian period in the early Paleozoic era. It includes vertebrates such as fish, amphibians, reptiles, birds, and mammals, making it one of the most diverse and successful groups of animals on Earth.
Chick or the egg!
In someones pants??
The Porifera, or sponges
well the first thing was algae...and formed from there on
bacteria
First things first: there is no such thing as an "ecological phylum". A phylum is a taxonomic term. Horses are in the Phylum Chordata, and the Subphylum Vertebrata. They are in the Class Mammalia.
Read your science book chapter . It is on the first page.
the animals come on earth because god put them there