Some of the earliest animals to successfully adapt to life on land were the:

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Arthropods, which include insects, spiders, and crustaceans, were some of the earliest animals to successfully adapt to life on land. They were able to do so with the development of specialized respiratory and sensory systems, as well as strong exoskeletons to support their bodies in the absence of water. Trilobites were mainly aquatic creatures, while amphibians and aquatic vertebrates evolved later on in the timeline of land-dwelling animals.

Some of the Earliest Animals to Successfully Adapt to Life