write the difference between mollusca and porifera
Answers
Porifera are aquatic organisms known as sponges, while cnidarians are for example jellyfishes, corrals, etc. Poriferans are the most simple multicellular animal organisms. They are always sessile while cnidarians may be sessile (the corrals) or free living (jellyfishes).
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Mollusca
The animals in this particular phylum are known as mollusks. Mollusks make up the largest group of water animals even though some classes of mollusk can be found in hot, dry environments and forest habitats. However, mollusks must keep their bodies moist in order to stay alive. Most of the mollusks that live on land can be found in damp places such as in the soil or underneath logs, rocks or leaves.
Mollusks are characterized as having a soft, fleshy body, which, in many species, is covered with a hard shell. There are seven classes of mollusks which have been identified by scientist, but I will discuss the following three classes in this unit: univalves, or class Gastropoda, bivalves, or class Bivalvia, head-footed, or class Cephalopoda. These are the most popular mollusks within this phylum. The common name for each group so that the scientific name will not intimidate the audience for which this paper is intended.
Porifera
This phylum contain pore-bearing animals known as sponges. There are approximately three hundred thousand species of sponges. They live in aquatic, mainly marine habitats. They grow attached to rocks and other debris on the ocean floor. For a long time scientist thought that these animals were plants because they lack the ability to move about like other animals. Poriferans are the most simplest of the invertebrate animals in structure.
Sponges are divided into three different classes according to their skeletons: (1) chalky, (2) glassy, or (3) spongin—a protein material. The skeleton protects and supports the sponge’s body. The body of a sponge resembles a sac full of holes called pores. Water carrying food and oxygen enters through the pores. These substances are taken in through the central cavity called the spongocoel, where food and oxygen is filtered out and waste is passed through the top opening. The spongocoel also houses several flagellated (whiplike organs) which forms currents to keep water flowing through its pores.
Sponges also possess the ability to regenerate, or regrow old body parts. When the cells of a sponge are torn apart or separated, they reaggregate to form a complete sponge again. If clusters of different species of sponges where place in isolated containers of sea water, they would reorganize and sort themselves out and produce a new sponge of each class.
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