User:Katelyn R. Porter/Notebook/Biology 210 at AU/2014/07/15
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0715, T4, InvertebratesPurpose: to understand the importance of invertebrates and to learn how their simple systems have evolved into more complex systems.
Materials and Methods Cross sections and whole mounts of Planaria, nematodes, and Annelida were observed under a microscope.
The cross section of the Planaria showed the ectoderm and endoderm germ layers. It did not contain a fluid filled cavity, the coelom, and the pharynx and simple digestive tract were visible in the whole mount of the organism. Planaria exhibit a slow creeping motion, which was unable to be seen because the organisms were dead. They exhibit this motion because of their long, wide, flat body structures and less developed muscular system. A cross section and whole mount are depicted in Figures 1 and 2. Figure 1: Figure 2:
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Materials and Methods The Berlese set up was broken down and the top organisms were poured from the tube into a petri dish, then the bottom organisms were poured from the tube into a different petri dish. Both dishes were examined under a dissecting microscope
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