Given the question: Answer the following question given this paragraph: The oldest animal fossils are about 630 million years old. The earliest animals were aquatic invertebrates. The first vertebrates evolved around 550 million years ago. By 500 million years ago, most modern phyla of animals had evolved. Q: What type of invertebrates where the earliest animals? Choices: - cnidaria - arachnids - annelids - aquatic invertebrates A:
The answer is:
aquatic invertebrates