Q: What type of invertebrates where the earliest animals?


Read this paragraph and choose the correct option from the provided answers:

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.

 Choices:

- cnidaria

- arachnids

- annelids

- aquatic invertebrates


A:
aquatic invertebrates