Q: What kingdom of organisms constitutes up to 20 percent of all living things on earth in mass?


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

Not all archaeans live in extreme conditions. In fact, archaeans are now known to live just about everywhere on Earth. They make up as much as 20 percent of Earth's total mass of living things.

 Choices:

- protists

- sporozoans

- vertebrates

- archaeans


A:
archaeans