Clones are genetically indentical organisms. Nature makes clones:
By asexual reproduction
Some organisms reproduce asexually (without sexual reproduction). This means that there is only one parent, and the offspring are genetically the same as each other and the parent. This often occurs in plants.
When cells of an embryo split
A single egg is fertilised by a sperm and an embryo begins to develop as normal. Occasionally, the embryo splits into two, and two separate embryos begin to develop. The two embryos are genetically identical. This occurs within humans; this is how identical twins are born.
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