The respiratory system . does not work with any other systems
removes carbon dioxide from the body
supplies the body with oxygen
includes the lungs
does not need blood to work

Reacts to external environmental conditions and protects the body's deeper tissues; Includes skin, hair, nails, and sweat glands.

Explanation:

2. Removes Carbon Dioxide from the body

3. Supplies the body with Oxygen

4. Includes the lungs

Explanation:

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genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).