Cnidarians have no circulatory systems.
There are no respiratory organs, and both cell layers absorb oxygen from and expel carbon dioxide into the surrounding water. When the water in the digestive cavity becomes stale it must be replaced, and nutrients that have not been absorbed will be expelled with it.
Corals are classified as members of the phylum Cnidaria, which includes other animals such as jellyfish and sea anemones. Within the phylum Cnidaria, corals belong to the class Anthozoa. They are further divided into two subclasses: Hexacorallia (includes stony corals) and Octocorallia (includes soft corals).
Sargassum is a type of brown seaweed belonging to the Phylum Phaeophyta.
The phylum for adder's tongue, a type of fern, is Pteridophyta.
The phylum for diatoms is Bacillariophyta. Diatoms are a type of algae that belong to this phylum and are characterized by their unique silica cell walls.
Phylum Cnidaria.
Jellyfish belong to the class Scyphozoa, phylum Cnidaria.
Due to their similarities, it was originally considered that both comb jellies and cnidarians went in the Phylum Coelenterata. However, these days, comb jellies are considered as Phylum Ctenophora and cnidarians as a separate phylum Phylum Cnidaria. Cnidaria includes box jellies, jellyfish, hydra, sea anemones and corals.
Anemones are non-colonial coral in the class Anthozoa which in the phylum Cnidaria.
An open circulatory system.
A closed circulatory system
Closed Circulatory system
closed circulatory system
They have a closed circulatory system.
closed circulatory system.
closed circulatory system.
They have a closed circulatory system.