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This is a picture of a rotifer, one of the organisms that I found in my hay infusion. This rotifer was one of the bigger organisms on my whole slide. He would cruise around rather quickly with his little tentacles moving like crazy and sucking everything up. To me, rotifers just act like vacuums.
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This little guy was also found in my hay infusion and is called a paramecium. When I was watching him move around with jerky movements on my slide in lab, I thought he was eating the whole time. I later found out that paramecium's are actually exchanging sexual material. When you are able to look at a paramecium under a microscope, you can see that all along the outside of their body are hair-like tentacles that are used for moving around. Paramecium reproduce through a process called binary fission which means they split in half and become two new organisms. Binary fission is just one type of asexual reproduction.
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These organisms are called colonial flagellate and they hardly moved if at all while I was watching them through a microscope. The theory that a lot of biologists share is that colonial flagellate colonies gave rise to all animals. These organisms are basically free-swimming hollow balls of eukaryotic cells. During cell division, colonial flagellate undergo cell proliferation which results in a solid, two layered protoanimal.
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Cosmarium are yet another pond water organism. It appears that this organism is just about ready to break in half. In truth, Cosmarium are actually made up of two semi cells, which is why they look like they are going to split in half. During cell division, the two semi cells come apart and each semi cell produces a new semi cell and becomes a whole organism again. Then the process is started over and over and over.
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Closterium are pond water organisms that undergo sexual reproduction and cell division resulting in two gametangial cells. These two cells are formed from one vegetative mother cell. While watching these organisms under a microscope, I noticed that they hardly moved at all, just like the colonial flagellates appeared to be just sitting or floating in one spot the whole time.