An essential material for photosynthesis is/are

The raw materials of photosynthesis, water and carbon dioxide, enter the cells of the leaf, and the products of photosynthesis, sugar and oxygen, leave the leaf. Water enters the root and is transported up to the leaves through specialized plant cells known as xylem vessels.

b would be the right answer

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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