2 answers:
Answer:
Explanation:
photosynthesis consists of two major phases
Light reactions
Dark reactions
oxygen is produced in light reaction by the oxidation and reduction of carbondioxide and water.
A n s w e r :
Plants take in carbon dioxide from the atmosphere, water from the soil and light energy from Sun.
Photosynthesis occurs.
Oxygen and energy are produced.
There are 21% of oxygen in the atmosphere.
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External skeleton is the correct answer. Hope this helps out !
Normal sex cells will have 23 chromosomes
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