Because they have no backbone.
Yes I think they are
Yes
because they do not have backbones
Rabbits are vertebrates as they have a spine.
useful to man for kitchen sponges
There are4
no they are vertabrates cause they have a back bone
Glass sponges are considered the class Hexactinellida.
No other animals are believed to have evolved from sponges, thus they win the title of "an evolutionary dead end."
They are macro invertbrates in which cannot stand pollution.
Sponges are considered ANIMAL life not plant life. Therefore they do not give off oxygen, they consume it.
Sponges are heterotrophic, which is a characteristic of an animal and not a plant. Sponges are also multicellular, are made up from cells without cell walls, characteristics of the kingdom Animalia and NOT Plante.