Sponge:- The sponge is asymmetrical also known as radial symmetry. No cephalization. They reproduce by releasing sperm into the water, but some are asexual. They have a stiff skeleton made of spicules in a tube-like shape. They create a habitat for marine animals because they improve nutrient cycles and lower nitrogen levels in coral reef systems. Spicules on sponges direct sunlight, which allows them to get enough light.
Sponges live in deep water, but not so deep so they can still get light and nutrients they need.
Jellyfish- Structure/Function: The jellyfish has two simple body plans, a medusa and a polyp form. The polyp attaches itself and remains sessile. They are asexual, and reproduce by budding. They lack organs, but have specialized cells that are organized into tissues. To eat, cilia line a gastrovascular cavity, and they move food, which gets digested by vacuoles. Jellyfish breathe through diffusion and have radial symmetry about the surface of the mouth. Jellyfish bloom formation is a intricate process that depends on ocean currents, nutrients, sunshine, temperature, season, prey, reduced predation, and oxygen concentrations. Ocean currents tend to congregate jellyfish into large swarms or "blooms", which consist of hundreds or thousands of individuals. Blooms can also result from unusually high populations in some years. Jellyfish are better able to survive in nutrient-rich, oxygen-poor water than competitors, and thus can feast on plankton without competition. Jellyfish may also benefit from saltier waters, as saltier waters contain more iodine, which is necessary for polyps to turn into jellyfish.
Squid- Moluccas are determined through a mantle with a significant cavity used for breathing and excretion, the presence of a radula, and the structure of the nervous system. The mantle is used for breathing and excretion and is the main structure for the body and covers the bodies organs. They also have two main nerve cords, which is a major cord of nerve fibers running the length of an animal's body.
Earthworm- The earthworm advanced in complexity referring to the phylum Annelida compared to Cnidaria and Porifera because it has body symmetry, and a one way digestive system. Also, it respires through it's skin and has a closed circulation.
Grasshopper: Compared to other phylas, the grasshopper is much more complex. They are segmented creatures with bilateral symmetry. Grasshoppers have much more advanced appendages for tactile sense. They also have very advanced movement appendages like walking legs, jumping legs, and wings. Grasshoppers have a more advanced respiratory systems than the rest of the phylas. Oxygen is absorbed through the thorax and distributed throughout the body.
Fish- The body shape of the fish is slim and long, this is an adaption for life in the water because it help the fish swim faster through water possibly to get away from predators and/or get prey. The gill raker prevents any debris from going into the gills. The scales direction are moving towards the back of the fish. The advantage to this is that the water glides smoothly over it. The fish has two nostrils that are smaller than ours, and not directly connected to a brain. I noticed that the gills
Frog :(- Frogs are a kind of small animal belonging to a group called vertebrates (animals with backbones) known as amphibians. This mean that they live part of their life in water and the other part of it on land. Amphibians are cold-blooded animals. This mean that their body temperature is the same as the surrounding temperature. Their skin absorbs water into their body so they do not have to drink water to survive. Examples of other amphibians are salamanders and caecilians. Frogs have strong hind legs to enable them leap forward at a great distance.