Its definetly not C or D and B sounds ridiculous so its A.
        
                    
             
        
        
        
In addition, the sum of the allele frequencies for all the alleles at the locus must be 1, so p + q = 1. ... In population genetics studies, the Hardy-Weinberg equation can be used to measure whether the observed genotype frequencies in a population differ from the frequencies predicted by the equation
        
             
        
        
        
<span>The different adrenal hormones show selectivity for different types of adrenergic receptors. This may be because the chemical structures of the adrenal hormones are such that binding is biochemically easier for the hormones at the receptors to which they show a selective affinity.</span>
        
             
        
        
        
Answer:
 What hypothesis were the researchers testing in this study? The disease-suppressive properties of soils are due to the activities of soil microorganisms.
Explanation:
Scientists wanted to know if microorganisms protect against crop disease. Researchers tried to figure out if microorganisms were responsible for the protective effects of disease-suppressive soils. The spil layer surrounding plant roots is called. When plants are attacked by fungal or bacterial pathogens, soil from the rhizosphere may protect them from future attacks.
 
        
             
        
        
        
The answer for the above questions is the Angiosperms. It is a type of plant that provides nearly all of the non-meat food for the human population. Angiosperms are vascular, flowering plants, that have seeds that are enclosed within an ovary, unlike the gymnopserms that have no flowers or fruits and have unenclosed seeds on the surface of scales or leaves, often called cones.