There are several organ systems in the body. One of them would be the respiratory system. There are many more including the heart, digestive, and the skeletal.
Can u please add a little more? I don't know anymore.
Maybe if you show the question people could answer
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This is the basis for Chargaff's rule; because of their complementarity, there is as much adenine as thymine in a DNA molecule and as much guanine as cytosine. Adenine and thymine are connected by two hydrogen bonds, and cytosine and guanine are connected by three hydrogen bonds
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Heredity | Khan Academy
Reading a pedigree · Determine whether the trait is dominant or recessive. If the trait is dominant, one of the parents must have the trait.