Question

8. The first animals are thought to have evolved over
years ago.
550 million
500Million
400 Million​

Answer 1

Early animal had 'complex behaviour' A millipede-like creature from 550 million years ago is among the earliest examples of an animal showing complex behaviour. Long before the dinosaurs walked the Earth, the four-inch long creature dragged its body along a muddy sea floor and became fossilised.

500 million years ago

The first animals to do so were probably euthycarcinoids – thought to be the missing link between insects and crustaceans. Nectocaris pteryx, thought to be the oldest known ancestor of the cephalopods – the group that includes squid – lives around this time.

Insects may have evolved from a group of crustaceans. The first insects were land bound, but about 400 million years ago in the Devonian period one lineage of insects evolved flight, the first animals to do so.

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Answer 2

The first animals are thought to have evolved over (550 million) years ago