Sequence the events that led to oxygen becoming part of Earth's atmosphere. _Earth's atmosphere contained carbon dioxide, nitrogen, and
water vapor.

_Rains washed carbon dioxide out of the atmosphere and into
the oceans.

_Early life forms in the seas used carbon dioxide during
photosynthesis.

_Oxygen levels in the atmosphere built up.
_Earth cooled and became more solid.

_Early life forms released oxygen and water vapor.

The graph shows the amount of global warming happening in different ecosystems. which populations of organisms will likely decline the most as a result of climate change, and why? a.coral reefs because of the loss of the symbiotic algae living within their bodies b.penguin populations because the fish they eat will move into warmer waters c.mountain-dwelling birds because rising sea levels will relocate their food sources d.large cats in the rainforest because of decreased habitat loss for their prey