Quiz: History of Life on Earth

What is the correct sequence of events in Earth's biological history?

• Humans → Dinosaurs → First Cells

• First Cells → Dinosaurs → Humans

• Dinosaurs → First Cells → Humans

• Humans → First Cells → Dinosaurs

When did the Earth form, according to scientific estimates?

• 2.5 billion years ago

• 3.5 billion years ago

• 4.5 billion years ago

• 5.5 billion years ago

What era is known as the "Age of Reptiles"?

• Paleozoic

• Cenozoic

• Mesozoic

• Precambrian

Which organism is believed to be the first form of life on Earth?

• Multicellular animals

• Algae

• Bacteria

• Dinosaurs

What important gas did early cyanobacteria release into the atmosphere?

• Nitrogen

• Carbon dioxide

• Oxygen

• Methane

The Cambrian explosion refers to:

• A volcanic eruption

• Sudden appearance of diverse life forms

• Extinction of dinosaurs

• Formation of Earth

In which era did mammals become dominant?

• Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

What caused the extinction of dinosaurs about 66 million years ago?

• Earthquake

• Meteor impact

• Ice age

• Evolution of mammals

Which of the following is the earliest era in Earth's history?

• Mesozoic

• Cenozoic

• Paleozoic

• Precambrian

Fossils are important because they:

• Tell us about the weather

• Show the growth of plants

• Provide evidence of past life

• Contain vitamins