Geologic Time Quick Check
1 of 51 of 5 Items
Question
How did the success of photosynthetic bacteria change Earth’s atmosphere?(1 point)
Responses
decreased oxygen concentration
decreased oxygen concentration
decreased hydrogen concentration
decreased hydrogen concentration
increased oxygen concentration
increased oxygen concentration
increased hydrogen concentration
increased oxygen concentration
Geologic Time Quick Check
2 of 52 of 5 Items
Question
How did reduced methane concentrations in the atmosphere affect Earth?(1 point)
Responses
Earth warmed.
Earth warmed.
Volcanic activity increased.
Volcanic activity increased.
Earth cooled.
Earth cooled.
Volcanic activity decreased.
Earth cooled.
Geologic Time Quick Check
3 of 53 of 5 Items
Question
Which option orders the events chronologically, from earliest to latest.(1 point)
Responses
Single-celled organisms increase atmospheric methane concentrations. Photosynthesizing bacteria release oxygen into the sea. Oxygen concentrations increase in the atmosphere. Many new animal species evolve.
Single-celled organisms increase atmospheric methane concentrations. Photosynthesizing bacteria release oxygen into the sea. Oxygen concentrations increase in the atmosphere. Many new animal species evolve.
Single-celled organisms increase atmospheric methane concentrations. Oxygen concentrations increase in the atmosphere. Photosynthesizing bacteria release oxygen into the sea. Many new animal species evolve.
Single-celled organisms increase atmospheric methane concentrations. Oxygen concentrations increase in the atmosphere. Photosynthesizing bacteria release oxygen into the sea. Many new animal species evolve.
Many new animal species evolve. Single-celled organisms increase atmospheric methane concentrations. Photosynthesizing bacteria release oxygen into the sea. Oxygen concentrations increase in the atmosphere.
Many new animal species evolve. Single-celled organisms increase atmospheric methane concentrations. Photosynthesizing bacteria release oxygen into the sea. Oxygen concentrations increase in the atmosphere.
Photosynthesizing bacteria release oxygen into the sea. Oxygen concentrations increase in the atmosphere. Many new animal species evolve. Single-celled organisms increase atmospheric methane concentrations.
Single-celled organisms increase atmospheric methane concentrations. Photosynthesizing bacteria release oxygen into the sea. Oxygen concentrations increase in the atmosphere. Many new animal species evolve.
Geologic Time Quick Check
4 of 54 of 5 Items
Question
Which forms of life were dominant in the Mesozoic era?(1 point)
Responses
mammals
mammals
birds
birds
reptiles
reptiles
one-celled animals
reptiles
Geologic Time Quick Check
5 of 55 of 5 Items
Question
Which characteristic defines the Paleozoic era?(1 point)
Responses
Simple, one-celled life forms were dominant.
Simple, one-celled life forms were dominant.
Animals with shells and hard parts were dominant for the first time.
Animals with shells and hard parts were dominant for the first time.
Reptiles became dominant after a mass extinction.
Reptiles became dominant after a mass extinction.
Mammals and other warm-blooded animals became dominant.