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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.

9 answers

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.
How did reduced methane concentrations in the atmosphere affect Earth?(1 point)
Responses

Earth cooled.
Earth cooled.

Volcanic activity decreased.
Volcanic activity decreased.

Volcanic activity increased.
Volcanic activity increased.

Earth warmed.
Earth cooled.
Which characteristic defines the Paleozoic era?(1 point)
Responses

Reptiles became dominant after a mass extinction.
Reptiles became dominant after a mass extinction.

Animals with shells and hard parts were dominant for the first time.
Animals with shells and hard parts were dominant for the first time.

Simple, one-celled life forms were dominant.
Simple, one-celled life forms were dominant.

Mammals and other warm-blooded animals became dominant.
Animals with shells and hard parts were dominant for the first time.
Which forms of life were dominant in the Mesozoic era?(1 point)
Responses

one-celled animals
one-celled animals

mammals
mammals

reptiles
reptiles

birds
reptiles
How did the success of photosynthetic bacteria change Earth’s atmosphere?(1 point)
Responses

decreased hydrogen concentration
decreased hydrogen concentration

decreased oxygen concentration
decreased oxygen concentration

increased oxygen concentration
increased oxygen concentration

increased hydrogen concentration
increased oxygen concentration