Answer:
The circulatory and respiratory systems work together to pump blood and oxygen throughout the body. Air moves in and out of the lungs through the trachea, bronchi, and the bronchioles. Blood moves in and out of the lungs through the pulmonary arteries and veins that connect to the heart and thats how it works.
Explanation:
The answer would be, Heterozygous Genotype.
Hope that helps!!!!
The natural selection process applies majorly inside back species wether than between species.