4 Fe + 3 02 2 Fe2 O3

In this chemical equation, why is the number of atoms the same on each side of the arrow?

Chemical reactions reduce matter but create energy.
Chemical reactions produce new matter.
Matter cannot be created or destroyed.

Matter cannot be created or destroyed.

Explanation:

According to law of conservation of matter, Matter can neither be created nor destroyed. It just gets converted into other forms.

So, It's important to equalize the no. of moles on either side of the chemical reaction.

Hope this helped!

answer: they produce more slow than unicellular organisms.