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The topic of the lecture is about the animals how to protect themselves with each other's various ways. During the lecture, the professor mentioned about shells and hedgehogs-porcupines. The first one he discussed was a hard part of shell. It will be very defensive to other animals and animals who has shells will be safe. The second example the professor cited was a thorn part of hedgehogs. Also, exampled with a animal called porcupines.
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