Invertebrates consisted of single-celled animals (protozoa), porous animals (sponges), animal hollow (coelenterate), animal worms (Vermes), jointed animals (arthropods), soft animals (molluscs), skinned animal spines (echinoderms).
1. Animal celled (protozoan). His body is composed of a single cell.
2. Animals porous (sponges). Animals porous body composed of many cells, but no nerves and muscles. Fine pore in his body is the entrance of water. Inside the cells there are fluffy whip. The cells are useful for absorbing soluble food along the water passing through it.
3. Animal hollow (coelenterate). The animal's body hollow. They have tools such as hair cells that contain toxins that can be inserted into the body of its prey.
4. Animal worms (Vermes). No body shape is like pita (flat) and elliptic (gilig).
5. Animal jointed (arthropods). Animals jointed legs are composed of jointed stems.
6. Animal software (molluscs). His body was soft, not jointed and rich mucus glands.
7. Animals skinned thorns (echinoderms). Feels rough. Small thorns and calcium abundant in the skin.
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