Solid waste and methane are excreted by the system while carbon dioxide is excreted by the and respiratory systems.
excretory; circulatory,
digestive; circulatory,
circulatory; excretory

Solid waste and methane are excreted by the Excretory systems , the most important organ in excretory systems are our kidneys, which is responsible to dump our solid waste and methane through urine.

menwhile, our circulatory systems is responsible for excreting carbon dioxide through blood plasm.

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It is evolution, because we all have some of the same traits like eye color or shape or ears.