A: incorrect because there will be no effect on keeping the rats in separate cage in the same room at the time of the experiment.
C: incorrect because it's depend upon scientist whether he wants to record the observation on the graph or on the table. Thus, no affect will be caused on the observations.
D: incorrect because peer review is done only after the experiment is completed.
Thus, statement B is correct because the growth graph of male and female of any species is different. Male tend to grow more than their female counterparts. So, for the process of the study it is essential that all the rats included are either male or female.
Hence, option (B) is correct.
→
is the balanced chemical equation.
<h3>What is a balanced chemical equation?</h3>
A balanced chemical reaction is an equation that has equal numbers of each type of atom on both sides of the arrow.
Half-reaction method:
Unbalanced chemical equation:
→ 
Oxidation half-reaction:
→ I
Reduction half-reaction:
→ 
Balanced chemical equation:
→ 
Oxidation number method:
Unbalanced chemical equation:
→ 
→ 
→ 
Balanced chemical equation:
→ 
or
→ 
Hence,
→
is the balanced chemical equation.
Learn more about the balanced chemical equation here:
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Farmer because a farmer needs the soil to grow his crops and if a power plant leaks he will have no more crops