The answer is
C. Both systems help remove carbon dioxide from the body.
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The correct answer is: A. A change in a cell's genetic material.
Mutations occur in DNA as a result of mistakes during the DNA replication (when repair mechanisms don’t fix it) or as the result of environmental factors (e.g. UV light). Mutations can have positive impact, by increasing the genetic variation or can have negative effect, causing the diseases or cancer.
Detective= they uncover mysteries and understand how things happen by sampling blood and looking for clues
The number of electrons is 10