Question

What type of organisms dominated during the Proterozoic era?

Options

• Blue-green algae and bacteria

• Land vascular plants

• Dinosaurs and reptiles

• Complex multicellular animals

Answer 1

The Proterozoic era, occurring 1500 million years ago, is designated the 'Era of Early Life' and was dominated by blue-green algae and bacteria. Simple marine invertebrates also began to originate during this period.