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Echinoderms
EduBook Organización
- 2916 visitas
3.1. Echinoderms Echinoderms are animals that live at the bottom of the sea. They do not have a head. They have an external skeleton consisting of plates with spines. The majority of echinoderms have a…
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Sponges, cnidarians and echinoderms
EduBook Organización
- 2811 visitas
Sponges Sponges are the simplest type of animal that exists. They live in water and are attached to rocks on the seabed. Sponges are often irregular in shape. Their bodies have lots of small holes that…