Answer:
1st has A and G whereas 2nd has C and T.
Explanation:
There are three common haplotypes present in the population. The first single nucleotide polymorphism has A and G alleles while on the other hand, the second single nucleotide polymorphism has C and T alleles. The four possible combinations of haplotypes for the above two single nucleotide polymorphisms are AC, AT, GC, and GT. 
 
        
             
        
        
        
<span>The ventricular system consists of four ventricles that are interconnected in the brain. 
The third ventricle</span> is the portion of the ventricular system is found within the diencephalon. It is a median cleft in the diencephalon between the two thalami, and is filled with cerebrospinal fluid (CSF).
The hypothalamus is the gland located within the floor of the this ventricle.
        
             
        
        
        
Answer:
1) As the body's chemical messengers, <u>hormones</u> transfer information and instructions from one set of cells to another.
2) A <u>gland</u> is a group of cells that produces and secretes, or gives off, chemicals.
3)  Hormones are released into the bloodstream via small tubes called <u>duct.</u>
4) Hormones find their way through the blood to their <u>targeted/respective </u>cells.
5) Each hormone is a differently shaped key that will only fit into the correct <u>receptor</u> lock.
 
        
             
        
        
        
"D" conserve resources.
The 3 R's were made to help people use and conserve resources wisely.
I hope this helps!
~kaikers