How long ago did invertebrates become common on Earth? 1.6 million years ago 132 million years ago 410 million years ago 520 million years ago

The correct answer is option D, 520 Million Years Ago

Reason -

The first invertebrates occurred in the oceans in the form of soft body animals which are covered by shell. These organisms appeared in the water bodies some 5 billion years ago (500 million years ago). The other species include the arthopods (insects), mollusk (snails and octopus), annelids (Earthworm and leeches) etc. also evolved some 490 million years ago.

520 million years ago