Question

explains the specific character s of each phyla​

Answer 1

Explanation:

Annelida Little ring Multiple circular segment

Arthropoda Jointed foot Segmented bodies and jointed limbs, with Chitin exoskeleton

Brachiopoda Arm foot Lophophore and pedicle

Bryozoa Moss animals Lophophore, no pedicle, ciliated tentacles, anus outside ring of cilia

Answer 2

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Phylum porifera includes most primitive and simplest of all multi-cellular animals commonly known as sponges. Robert Grant game the name porifera to sponges. About 5,000 species of sponges are known to us. Most of the sponges are marine in habitat, but some of them live in freshwater. Adults are sessile and often found in colonies attached to under water objects. Some spnges have been reported from rocks more than 600 million years old. The main characteristics of sponges are as follows:

1. Sponges are multi-cellular organisms with cellular grade of body organization. Sponges do not have any tissues or organs. Body of sponges is diploblastic, i.e., body consist of two germ layers.
2. Sponges are sedentary aquatic animals mostly marine, a few freshwater forms occurring singly or colonies.
3. The shape of sponges is variable mostly plant like, radially symmetrical or asymmetrical.
4. Body surface is perforated by numerous minute inhalant pores, the ostia, to admit a water current which after circulating through a canal system inside the body pases out through more larger exhalent openings, the osculum.
5. Animals lack alimentary canal. The body cavity is spongocoel, which opens exteriorly through osculum act as digestive canal. Digestion is entirely intracellular.