Sponges Sponges can reproduce sexually and asexually. They digest, circulate, respirate, and excrete using diffusion, which is random moving. Different species of sponges also have one of the three types of sponge skeletons: calcareous laminae, organic filaments, and siliceous and calcareous spicule. Sponges are so basic that they don't even have symmetry. Jelly Fish Jelly fish were the first organism to develop cartilage in the body to provide structure. They digest and excrete though the mouth because of a one way digestive tract. Jellyfish also developed a nerve net that can respond to chemicals and touch called a primitive nervous system. These early advancements in evolution allowed jelly fish and the rest of the phylum to be successful for millions of years. Squid The phylum 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 annelids are bilaterally symmetrical, triploblastic, coelomate, invertebrate organisms, which allows them to have a back bone. The one way digestive tract enabled more efficient food transfer that has allowed annelids to be successful for millions of years. Grasshopper Perch 1. The fish has a full respiratory system that allows it to breathe water. It also has fins to help it swim in water. 2. They are involved with the suspension of feeding smaller prey. 4. The scales face towards the posterior of the fish, allowing it to swim faster. 5. 2 nostrils and they are tiny holes. 6. They open easily, allowing air and particle filtering to be easy. 7. It is used to detect movement. 1. The endoskeleton allows the fish to float in the water, which is helpful because it is in the water full time. |