Answer and Explanation: The answer is false, as it is a network of neurons, however it is embedded in the wall of the gastrointesinal system.
Answer:
Horses are diphyodontous, erupting a set of first deciduous teeth (also known as milk, temporary, or baby teeth) soon after birth, with these being replaced by permanent teeth by the age of approximately five years old.
Explanation:
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Im not 100% sure but the best answer I can give is Prokaryotes because they came to be around the time oxygen did as well.
