What kind of primitive animal is Spongebob?

Spongebob is a primitive multicellular animal.

Spongebob belongs to sponges. Unlike other animals, they have no real tissues and organs, only cell differentiation. Sponges can't walk and stick to the bottom of shallow water. Their "hunting" way is to filter the microorganisms that enter the "sponge". They have different shapes, such as block, tube, fork, umbrella, cup, fan or indefinite.

Sponge is a kind of porous filter-feeding organism, which originated from Cambrian 570-500 million years ago, among which 390 genera have been confirmed to have originated from Cretaceous (65438+3500-6500 million years ago). There are about 5,000 species of Sponge, belonging to 80 families and 790 genera, which are distributed all over the world, from fresh water to marine life, from intertidal zone to deep sea.

Extended data:

Characteristics of sponge:

1. Sponge is a multicellular animal, but its cells basically have no tissue differentiation;

2. Obtain nutrition by filtering organic particles and small organisms and performing intracellular digestion;

3. It has a unique gully system (according to its complexity, it can be divided into three types: single gully type-such as white sponge, double gully type-such as hairy pot and multi-gully type-such as Xie Lao Xue Tong);

4. Embryo development reversal;

5. No nervous system;

6. Asymmetry or radial symmetry.