Flatworm

widely known as flatworms, were the first to develop bilateral symmetry, triploblasty, and cephalization. Bilateral symmetry means that an animal's left and right side of their body are mirror images of each other. Cephalization is the development of nervous tissues becoming concentrated towards the anterior end of an animal. Triploblasty means that an organism has three tissue layers, an ectoderm (outer layer), mesoderm (middle layer), and an endoderm (inner layer). Flatworms do not have a body…

diffusion gradient model which will cause development. The body parts of planaria was observed under a microscope. The flatworms were cut into 3 parts equally based on the gradient model . After a week, the new body parts were observed to have regenerated into new species. The hypothesis was rejected because the results did not match the hypothesis Introduction Planarians are freshwater flatworms that are usually found in…

McConnell conducted an experiment to explore how flatworms were able to receive memory through planarian cannibalism. In this experiment, he first trained a group of flatworms to learn and move around the maze while measuring the time they took. Then, he chopped the flatworms into pieces and fed them to another group of flatworms, which were able to learn more thoroughly about the maze than any other group of flatworms that weren’t fed the learned flatworms. Although he proclaimed that his own…

Just like pores on human skin which absorb elements of the world around us, the holes all over the sponge’s body as essentially pores as well. The function of the holes all over the sponge’s body is to allow water to be absorbed into the sponge’s body. Through the absorption of water, the sponge also absorbs food and oxygen to ensure survival. There is no one set type of symmetry for sponges. Therefore, not all sponges have the same type of symmetry. Sponges can range from asymmetrical to…

Discussion Dugesia regeneration is happening and the response rate to stimuli can be observed. Planarians have the ability to fully regenerate demonstrating the fascinating study of stem cells and tissue regenerations. The regeneration of the planarian may require the planarian to reshape its form by finding the right proportion to acquire the right shape and size of its body to form a functional, bilaterally symmetrical anatomy. The regeneration period can vary with different species, some…

Investigating the effect of cannibalism on light tolerance In this experiment, these people tested whether light tolerance could be transferred through chemical compounds in a species of flatworms. This idea was based off the fact that flatworms could apparently still have memories even if cut in two. What these people wanted to investigate was whether certain "memories" or acquired traits could be retained in a dead worm cut in half and transferred to another worm without the trait being lost.…

(2). Of the many organisms that contain these circadian genes, the one organism that coordinates their rhythm in an interesting manner is the freshwater planarian (Schmidtea mediterranea), which is the model for this experiment. The planarian is a flatworm that eternally maintains its juvenile stage and has a very impressive ability to regenerate, which makes them an excellent model for use in the…

able to preserve everything on the animal. This can be an issue because scientists then have to guess and/or use imagination to detail the rest of the animal. These things include, color, skin, eyes etc. Flatworms are interesting because they have no kind of fossils. Over 4000 species of flatworms is in existence today. Humans have many common ancestors with a wide variety of animals. Chimpanzees are especially a close branch in the tree. Humans and chimpanzees have no fossil records though.…

Coral reefs are Anthozoans. Scientists classify them as animals. They are the largest class of organisms in the phylum cnidarian. There are more than six thousand species. Coral reefs are communities of living things. They are known as the “rainforests of the oceans.” This is because there are sea slugs, oysters and many other creatures living there. Corals are animals related to anemones and jellyfish. They extend their tentacles to sting. A polyp is an individual coral consisting of a stomach…

types of macroinvertebrates from the two different sites within Dug Run. These macroinvertebrates include damselfly nymph, dragonfly nymph, caddisfly larvae, may fly larvae, crayfish, clams, aquatic worms, midge larvae, lymnaeid snails, leeches and flatworms. Table 2 shows the collected macroinvertebrates from the two separate collection sites within Dug Run. Site 1 - Near Confluence with Ottowa River Site 2- UNOH…