Cats and dogs are both mammals but they have distinct differences in their physical traits, behavior and lifestyle. For example, cats are solitary animals and are often aloof while dogs are social animals, and submit to a hierarchy. Additionally, cats groom themselves while dogs usually require bathing and grooming by a human.

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Cats and dogs may seem similar because they're both mammals, but they're actually pretty different! Cats are more independent and might not always want to hang out with you, while dogs love being part of a group and following a leader. Also, cats are really good at cleaning themselves, but dogs usually need a bath from their human friends.
The advantages of having an exoskeleton, like snails and beetles, include better protection from predators and the environment, and support for movement. However, the disadvantages may include less flexibility and limited growth potential, as they need to molt their exoskeletons in order to grow.

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Having an exoskeleton, like snails and beetles, is cool because it helps protect them from bad guys and gives them support for moving around. But sometimes it's not so great because they can't stretch as much and have to shed their old exoskeleton to get bigger.
Reptiles and mammals are both vertebrates but they differ in several ways. Reptiles are cold-blooded and have scales, while mammals are warm-blooded, have fur or hair, and give birth to live young instead of laying eggs.
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Reptiles and mammals both have backbones, but they're pretty different. Reptiles are cold-blooded and have scales, while mammals are warm-blooded, have fur or hair, and have babies instead of laying eggs.