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In what period did the largest known animal ever live?

Jurassic

Triassic

Cretaceous

Quaternary (now)

At 190 tonnes in weight, blue whale is the largest known animal ever to have existed. The tallest and heaviest sauropod known from a complete skeleton weighed 23–37 tonnes. There were much larger sauropods, but they are known from only a few bones, and it is unlikely they matched a blue whale.

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Tony Alter wikipedia → Largest organisms

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They have a large oxygen supply from the start

Oxygen is created during protein reduction

Oxygen comes in through pores in the shell

They don't need oxygen at all

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