Select the correct answer.
which question is testable?
a.
how does changing the amount of water affect the growth of corn?
b.
is it ethical to use human tissue removed during surgery for scientific research?
c.
are you happy with your new job?
d.
will people be disappointed if car insurance rates increase?

A.  How does changing the amount of water affect the growth of corn?

Explanation:

To test this question, all you have to do is buy corn, and keep them all in the same area with the same amount of sunlight, temperature, etc, and only change the amount of water each plant gets.

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answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.