The Whole History of Life on Earth

What event 4.5 billion years ago hastened the formation of stars in the Milky Way galaxy?

• Collision with a nearby dwarf galaxy

• Formation of the solar system

• Appearance of the first life forms

• Creation of the Earth's magnetic field

What process led to the formation of planetesimals?

• Evaporation of the water component

• Collisions and accumulation of small particles

• Formation of the Earth's liquid core

• Development of multicellular life

What was the Earth's early atmosphere rich in, which later transitioned into a CO2 ocean?

• Oxygen

• Nitrogen

• Carbon dioxide

• Methane

What mechanism is described as causing horizontal slippage due to the weight of the plate?

• Subduction

• Mantle convection

• Plate tectonics

• Erosion

By what process did the early building blocks of life form in the cave of a geyser?

• Emission of radiation from uranium ore

• Photosynthesis

• Oxidation of metals

• Polymerization under wet and dry cycles

What was the fate of the mother continent by four billion years ago?

• It became the habitat for early life

• It was destroyed and subsumed to the deep mantle

• It collided with another continent

• It was covered by an ocean

What event caused the Earth to undergo a global glaciation known as the snowball Earth?

• Intense volcanic activity

• A meteorite impact

• The formation of the supercontinent Pangea

• A collision with a Dark Nebula

What was the source of energy for life on Earth that shifted from nuclear geysers to?

• Volcanic activity

• Cosmic rays

• The Sun

• The Moon

What significant event occurred around 4.1 billion years ago affecting the ocean?

• It became less salty

• It was entirely frozen

• It evaporated completely

• It became extremely toxic

What led to the development of prokaryotic organisms, the ancestors of today's archaea and bacteria?

• The collision between the Milky Way and a dwarf galaxy

• The formation of the Earth's magnetic field

• The evolution of more durable DNA from unstable RNA

• The appearance of multicellular life