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Is this the world's oldest animal fossil?

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A possible sponge fossil dating back 890 million years could be the oldest animal ever discovered. Not all researchers are convinced that the markings left in the rock were made by an animal but, if they were, the new find could give us an insight into the evolution of the first animals.

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What is the significance of the wiggly lines described at the beginning of the video?

a

They are considered artistic engravings.

b

They might be the oldest fossil animal ever discovered, pushing back the first physical evidence of animals on Earth by 300 million years.

c

They are believed to be ancient plant fossils.

d

They are thought to be natural rock formations.

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