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.
Phylum Arthropoda, Subphylum Crustacea Crustaceans are specialized for life in the water Most possess gills to obtain oxygen Chitinous exoskeleton reinforced with CaCO3 Two pairs of antennae Barnacles are crustaceans!The wonderful world of crustaceans!he majority of marine arthropods are crustaceans (subphylum Crustacea). Crustaceans are distinguished from other Arthropods by their possession of a pair of biramous (two-parted) limbs, and by a nauplius larval stage. Includes barnacles, shrimp, krill, crabs, lobsters, and copepods.