Question

during photosynthesis, carbon dioxide and water combine according to the general equation:
energy
carbon dioxide + water → sugar + oxygen
why is photosynthesis a chemical reaction?

○ because new substances are formed

○ because an input of energy is required

○ because the reactants are compounds

○ because the products include an element

Explanation:

A chemical reaction is defined as a process where one or more substances are converted into new, different substances. In photosynthesis, reactants (carbon dioxide and water) are transformed into entirely new products (sugar and oxygen), which fits this core definition. The other options describe properties associated with photosynthesis but do not define what makes it a chemical reaction.

Answer:

A. because new substances are formed