Lit is located between the 
left ventricle and left atrium.Left atrium is known to be one of the four chambers of heart
that receives oxygenated blood from the right and left pulmonary veins. This blood
is pumps to the left ventricle through the mitral valve. However, left
ventricle is responsible for pushing oxygenated blood through the aorta to the rest
of the body.
 
        
        
        
Answer: DNA provides a set of chemical instructions to specific genes that the gene uses to make proteins in order to determine traits. 
Explanation: Genes provide instructions that are used to determine the sequence of amino acids needed to make up a protein. 
 
        
             
        
        
        
When our red-sensitive nerves in our eyes cannot respond to light properly this will result in color blindness - b. 
When either of the three light-sensitive nerves in our nerve tracts; either green, red or blue, we become to color blind for a certain spectrum of light from nature.