As part of the 7th grade biology unit on animals, the students looked at different phylum found within a particular kingdom. The class talked about the characteristics and important adaptations each have for survival. In doing so the students took part in multiple dissections in order to learn and compare the anatomy of common organisms. In their study of invertebrates, the seventh grade dissected a squid (part of the mollusk phylum) and a worm (the annelid phylum). Each organism has a different circulatory system, number of hearts, different sequence of body parts and the class learned that some invertebrates have no brain at all.
In the vertebrate group, students started out with a dissection of a bony fish, a perch and then a dogshark, which is a cartilaginous fish. Students were able to feel a back bone in a fish and the flexibility of a the shark. The seventh graders were able to feel the difference in the outer dermis and see the different reproductive parts of each animal. Students also noticed that more of the structures in the vertebrate group looked like that of humans.
Lastly, after a visit from Ms. Meredith’s chicken, Lightening, the seventh graders dissected a chicken egg . This allowed the students to see how the egg is formed and how all parts of the egg are necessary for the growth of a chicken.
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