The process that produces oxygen
is the photosynthesis and when oxygen is released as the result of its production during
photosynthesis, it is a
by-product of splitting the water molecules. The reduction of oxygen which forms water occurs during
respiration.
Pioneer species are found in area's undergoing secondary succession. For example ecosystems being established by: reducing a fire, deforestation; which quickly colonize open spaces supported by vegetation.
A is true because they do have a true nucleus or membrane-bound organelles .
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I hope this helps
