Overview:
In this project, we paired up with another student, my partner was Andrew. We looked at different invertebrates and examined their external anatomy, and dissected them to look at their internal anatomy.
Periphera
Sponges are good habitats because they help filter waste out of the water. Sponges and crustaceans share a beneficiary relationship. Sponges help disguise the mollusks and also can emit a toxin to ward off predators. In turn, the crustaceans take the sponges into clean water where it is easier to survive.
cnidaria
Porifera animals have no vital organs. Cnidaria do not have circulatory or respiratory systems. They use diffusion for respiration, circulation, and excretion. In order for Jellyfish to reproduce they use external fertalization and they reproduce sexualy and asexually. They feed buy paralyzing their prey and eat them in their gastrovascular cavity extracellularly. Bilateral Symmetry.
Annelida
In earthworms there are organs present. They have seven types of systems; they have the respiratory, muscular, circulatory, excretory, digestive, nervous, and reproductive system. The earthworm is segmented, and all of its organs lay in a fluid-filled cavity called the coelom. Compared to cnidaria and porifera, annelida has advanced by becoming cephalized (when important/specialized organs become concentrated in one area of an organism)
mollusca
Mollusks have a body wall protecting a body cavity. The vital organs are located inside of the body cavity. This means that they are coelomate. Also, mollusks are non-segmented.
anthropoda
Arthropods have open circulatory systems, which means that blood is confined into vessels in only part of the system. Their body is segmented and consists of a head, thorax, and a body. What stands out about the grasshopper’s anatomy is that they have jointed appendages including both legs for walking and legs for jumping. Arthropods have evolved to have jointed legs and an exoskeleton. The segmentation seen in previous invertebrates has fused together in arthropods to form three distinct segments; the head, the thorax, and the abdomen. Arthropods are also highly cephilized - intricate mouthparts, compound eyes, and delicate sensory feelers all being in the head portion of an arthropod.