EVERYDAY SCIENCE

Detailed explanation-1: -Characteristics of Coelenterata. These are mostly aquatic or marine habitat animals. These species exhibit a tissue-level organization. The mouth is enclosed by thin and short tentacles.

Detailed explanation-2: -Octopus have eight arms while squid and cuttlefish have eight arms plus two other specialized arms, called tentacles. The tentacles are adapted to snatch prey from farther away through their ability to extend and retract.

Detailed explanation-3: -Jellyfish, sea anemones, corals, and hydra are all cnidarians. Cnidarians catch food using armlike, stinging tentacles and their bodies have only two tissue layers, unlike higher animals who have three layers.

Detailed explanation-4: -Cnidarians range in size from tiny animals no bigger than a pinhead to graceful giants with trailing tentacles several meters long. Some animals that look similar to cnidarians are actually not part of the same phylum.