A good reason for why tobacco smoke is considered a carcinogen is because it causes mutations leading to cancer.
Answer:
A organ in a human or an animal
Explanation:
The answer is d.their cells have some differences in the sequence of nucleotides in their nucleic acids
Human and mice is both mammals and have similar structure and metabolism. There should be no big differences in biological or organic molecule. The big differences should be the sequence of the nucleic acids in their DNA. Mice could produce similar protein in human, but the DNA is different.
