History of the Earth Pt. 2 RTI

What event led to the formation of mitochondria in eukaryotic cells?

• An aerobic cell digested an anaerobic bacterium.

• An anaerobic cell ate an aerobic bacterium but did not digest it.

• A eukaryotic cell evolved the ability to produce oxygen.

• A prokaryotic cell developed a membrane-enclosed nucleus.

When did the Cambrian Explosion, a period of rapid diversification of complex life, occur?

• Approximately 2.1 billion years ago.

• Around 1.5 billion years ago.

• About 542 million years ago.

• Between 600-800 million years ago.

Which of the following was NOT a challenge organisms faced when transitioning from water to land?

• Developing support structures against gravity.

• Evolving new respiratory systems.

• Finding ways to avoid drying out.

• Adapting to increased competition for food.

What significant evolutionary development characterized the Devonian Period, also known as the "Age of Fishes"?

• The emergence of the first land plants.

• The appearance of the first fish with jaws.

• The colonization of land by insects and arthropods.

• The evolution of multicellular eukaryotes.

Which group of animals, characterized by having only one skull opening, are the ancestors of mammals?

• Archosaurs

• Synapsids

• Diapsids

• Pseudosuchians

What physiological advantage did dinosaurs possess over pseudosuchians during the Triassic Period?

• Stronger limbs for running

• More efficient breathing

• Larger body size

• Better camouflage abilities

Which of these dinosaur types is known to have lived during the Jurassic Period?

• Tyrannosaurus Rex

• Mosasaurus

• Stegosaurus

• Hadrosaurs

What event is widely accepted by scientists as the primary cause for the mass extinction that ended the Mesozoic Era?

• Widespread volcanic activity

• A significant meteor impact

• Gradual climate change

• A global pandemic

What significant ecological event allowed mammals to diversify extensively during the Cenozoic Era?

• The emergence of new plant species

• The extinction of non-avian dinosaurs

• A global warming trend

• The formation of new continents

What adaptations did mammals develop to effectively consume and digest grass, which is tough and low in nutrients?

• Enhanced sense of smell and taste

• Specialized teeth and complex, multi-chambered stomachs

• Ability to store large amounts of water

• Development of wings for easier foraging