A genus is composed of a number of similar SPECIES.
Explanation:
Inside the air sacs, oxygen moves across paper-thin walls to tiny blood vessels called capillaries and into your blood. A protein called haemoglobin in the red blood cells then carries the oxygen around your body.
The first stage is the light dependent stage and the second stage is the light independent stage.
if you need a more in depth explanation, i can give one :)
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