Explanation:
because it allows you to eliminate or isolate variable/ it allows the experiment to minimize the changes in all the variables except the one being test.
I'm not gonna choose bc I'm not 100% sure either so read what's above, think it over and choose wisely
hope I helped a little and good luck :)
 
        
             
        
        
        
Robert Hooke built his own compound microscope to examine tree bark.
        
                    
             
        
        
        
You have a population in hardy-Weinberg equilibrium for the m and n alleles. These alleles are codominant.  Allele frequency of m is 0. 4. 0.48 is the frequency of heterozygotes in the population.
An allele frequency has been computed by dividing the total quantity of copies of each of the alleles at that specific genetic location in the population by the number of points of time the allele of interest has been observed in a population.
The frequency of each genotype is typically calculated by dividing the population's total count of individuals by the number of people who have that genotype.
To learn more about hardy-Weinberg equilibrium, 
brainly.com/question/14665912
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C. it cant be a since it exist
        
             
        
        
        
Antenatal clinic is a clinic that is involved in provision of care to pregnant mothers. They are given advise on nutrition that is the food to eat and the ones they are not supposed to eat among other advises. The care is provided by doctors, midwifes and nurses. Pregnancy is divided into trimester namely first trimester ( first 3 months), second trimester (middle three months) and third trimester (last three months of pregnancy). During the third trimester many changes may be observed and the nurses may report the following findings to the provider during this trimester; they include varicose veins, Hemorrhoids and lordosis (change in the curvature of the spine) which are normal however client teaching is recommended. In addition, the findings may include leg cramps (normal) and fainting spells not normal but may be felt when the client is rising.