You owe your life to chloroplasts. The reason for this is that:
A) when we eat plants, it is the chloroplasts that are the nutritious part of plant cells.
B) chloroplasts produce all the water and carbon dioxide essential for life.
C) chloroplasts supply all the ATP needed by living organisms.
D) chloroplasts produce the oxygen we breathe and ultimately are the source of most nutrients we consume.
E) like the ancestors of mitochondria, the ancestors of chloroplasts were once bacteria taken up by a eukaryotic cell.
Answer: D
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