Most animals and plants are part of more than one food chain. If one part of a food chain alters, the whole food chain is affected. For example, if a disease suddenly wiped out caterpillars, it would affect mice, owls and many other animals.
This phylum consists of the jellyfish, hydra, sea anemones, corals, sea pens, sea wasps, and box jellyfish. There are about 9,000 species. Almost all are marine. This is another ancient group, with fossils perhaps reaching back to 700 mya.
Sponges or poriferans are animals of the phylum Porifera. Sponges are divided into the following classes mainly according to the compositions of their skeletons: 1.Calcarea â¦ 2.Glass sponges 3.Demosponges.