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Alla [95]
3 years ago
10

How long ago did invertebrates become common on

Biology
1 answer:
IrinaK [193]3 years ago
7 0

Answer:3.5 billion years ago

Explanation:About 3.5 billion years ago, the first microscopic organisms appeared in the ocean. The first invertebrates developed in the oceans. They were soft-bodied animals with a shell or carapace, such as these trilobites.

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