Chimeras are interesting organisms that have two different sets of DNA. Chimeras occur when two different zygotes fuse to form one organism. Some chimeras have no outward symptoms, while some have signs such as two different eye colors or two different blood types.
What roles do mitosis and meiosis play in the process?

Ifound this on google “aristotle (384–322 bc) in western scientific taxonomy the greek philosopher aristotle was the first to classify all living things, and some of his groups are still used today, like the vertebrates and invertebrates, which he called animals with blood and without blood.” i hope this you for what your looking for.

Gay-lussac's law i think.

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