following reasons:? Select one or more:
A. The chloroplasts that carry out photosynthesis in green plants are evolutionary descendents of early cyanobacteria.
B. They are known to be the earliest forms of life on Earth.
C. The methane they produce is a greenhouse gas that could have helped warm the early Earth, helping to resolve the Early-faint-Sun paradox.
D. Oxygen produced by their photosynthesis is thought to be responsible for the "great oxygenation event" about 2.3 billion years ago.
A. The chloroplasts that carry out photosynthesis in green plants are evolutionary descendents of early cyanobacteria.
B. They are known to be the earliest forms of life on Earth.
C. The methane they produce is a greenhouse gas that could have helped warm the early Earth, helping to resolve the Early-faint-Sun paradox.
D. Oxygen produced by their photosynthesis is thought to be responsible for the "great oxygenation event" about 2.3 billion years ago.