Early Earth Biology: Archean & Proterozoic

Multiple Choice

What is the most critical condition needed for large, complex animals to evolve?

• A much hotter climate and more volcanic eruptions.

• High atmospheric oxygen and an ozone layer for protection.

• The removal of all liquid water from the surface.

Multiple Choice

What is the time period of the Archean Era?

• 4.0 to 2.5 Billion Years Ago

• 2.5 to 1.0 Billion Years Ago

• 1.0 to 0.5 Billion Years Ago

• 0.5 to 0.1 Billion Years Ago

Multiple Choice

What were the characteristics of the environment described in the image?

• Toxic Air

• Weaker Sun

• Deadly Rays

• All of the above

Multiple Choice

What role did cyanobacteria play in the evolution of early life forms?

• They produced carbon dioxide

• They used sunlight to make food

• They lived near hydrothermal vents

• They were multicellular organisms

Multiple Choice

What was the impact of rising oxygen levels during the Great Oxidation Event?

• It supported the growth of anaerobic microbes

• It caused a mass extinction of anaerobic microbes

• It had no effect on life forms

• It increased biodiversity

Multiple Choice

What time period does the Proterozoic Era cover?

• 2.5 Billion to 541 Million Years Ago

• 541 Million to 65 Million Years Ago

• 65 Million to 2 Million Years Ago

• 2 Million to Present

Multiple Choice

How did the Snowball Earth period challenge life on the planet?

• By increasing temperatures

• By covering the planet in ice

• By creating new habitats

• By reducing nutrient availability

Multiple Choice

What role did modern tectonics play in the recycling of nutrients into the oceans?

• They caused global warming

• They recycled nutrients like phosphorus

• They created new landforms

• They had no impact on life forms

Multiple Choice

What are the main components of the nucleus as shown in the diagram?

• Nuclear Envelope

• Nucleolus

• Chromatin Material

• Endoplasmic Reticulum

Multiple Choice

What significant event in oxygen levels occurred during the Proterozoic Era?

• A decrease in oxygen levels

• A spike in oxygen levels

• No change in oxygen levels

• A gradual decline in oxygen levels

Multiple Choice

What role did stromatolites play in regulating the climate?

• They produced CO2

• They removed CO2 and added O2

• They had no impact on climate

• They absorbed sunlight

Multiple Choice

What significant development occurred during the Ediacaran Period?

• First hard-shelled animals appeared

• First soft-bodied animals appeared

• First land animals appeared

• First vertebrates appeared

Multiple Choice

Which era is the longest?

• Cenozoic
• Cambrian
• Precambrian
• Phanerozoic

Multiple Choice

Claire would like to show that fossils provide evidence of how old Earth is. She knows that the fossil record can be used to deduce geologic time scales and present a record of Earth’s history. Which fossils match the Precambrian time period^?

• flowers and dinosaurs

• bacteria and primitive marine plants

• coral reefs and amphibians

Multiple Choice

Which type of cell came first?

• Eukaryotic
• Prokaryotic
• Plant
• Both Eukaryotic and Prokaryotic cells evolved around the same time

Multiple Choice

Scientific evidence shows that the Earth is ___ years old.

• 4,500
• 45,000
• 4.5 million
• 4.5 billion