Mullosca

Organisms belonging to the phylum Mollusca include: shelfish(clams, oysters), snails, octopodes, and squid. The phylum mullosca is filled with a diverse group of animals, mostly aquatic. Molluscs have blateral symmetry and contain some of the most complex invertebrates such as octopodes. Most molluscs have two body opening used for both eating and expelling waste. some more complex organisms such as ocoopodes and squid have brains and a more human-like nervous system, but most molluscs have no brain and just nerves that controll movement. molluscs have gills to help them excange gasses under water.

molluscs have a relatively simple circulatory system that consists of hearts and "blood. the phylum Mollusca is one of the most diverse groups of invertibrates.

Annelida

Annelids are the segmented worms, their body is divided into many segments which affects many of their basic functions. probably the most common annelid is the earthworm, found almost everywhere on land. Annelids have bilateral symmetry, and two body openings. Annelids can live on land or in water. The circulatory and nervous system work together in annelids the blood is carried in a blood vessel and conected to the nervous system. Annelids can reproduce by regenerating pieces of themselves that break off into new worms, or they can reproduce sexually either with seperate sexes or hermaphroditicly, both worms have both male and female organs, and both become fertilized.

Nematoda

Nematodes are the round worms, that can be either parasidic or free-living, and live in great abundence in almost every place on earth. Nematodes have bilateral symmetry . Nematodes have no circulatory or respiratory systens so the use diffusion, the movement of matter, in this case gases, from and area or higher concentration to and area of lower concentration without the use of energy. Nematodes generally reproduce sexually, and produce eggs, the eccs hatch into larva which eventually become mature nematodes. A nematode's nervous system consists of two main nerves running paralell to the body of the worm with smaller nerves branching off.

platyhelminthes

Platyhelminthes are flatworms. they have bilateral symmetry. most have only one body opening if that. they can be parasidic or free living. Platyhelminthes reproduce sexually. They are hermaphoditic, which means they have both male and female sex organs and when they repeoduce they both become fertilized. they do not have a true circulatory or respiratry system, they exchange gasses through diffusion.

Cnidaria

Cnidarians are animals with radial symmetry and live in water. Some of these animals move, some do not. Cnidarians are some of the simplest organisms found in the water.Cnidarians include animals such as sea anemones (that's what nemo lived in), jellyfish, and coral.
cnidarians have radial symmetry, they have more than one line where they can be divided into two equal halves, like the pie shown below.Cnidarians have one body opening, the gastrovascular cavity, is used a cnidarians as both a mouth and an anus. Like many simpler organisms, cnidarians do not have a circulatory system or respiratory, instead they exchange

gasses by diffusion. Cnidarians have a netlike nervous system, with nerves all around the mouth and branching to the rest of the organism. Cnidarians reproduce asexually by budding, and sexually when the male sperm and the female egg are released into the water and unite to become a fertilized zygote.

Porifera

Porifera is a phylum of invertebrates containing sponges. Sponges are the simplest as well as the oldest of all of the invertebrates.Sponges have no symmetry, in other words, there is no line that can be drawn on a sponge to divide it into two mirrored halves. Sponges do not have body openings, instead they have pores that function for obtaining nutrients and they use water to propel waste away from them. Sponges reproduce asexually by budding, and sexually bu releasing sperm and eggs into the water and having the eggs get fertilized. When budding occurs, a smaller sponge begins to grow on the parent sponge. Sponge also have a great abilito to regenerate, if a piece of a sponge breaks off it can become a new sponge. Sponges do not have a true circulatory system, instead they filter water through their bodies and obtain oxygen by diffusion, the movement of some form of matter from an area of high concentration to an area of lower concentration.





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