Do organisms create exact copies of themselves?
Asexually reproducing organisms can make exact copies of themselves. But it is impossible that all organisms produce similar organisms. In sexually reproducing organisms there is variation due to the combination of genes. The variation may be in their structural and physical appearance.
Though all of us have eyes, ears, nose, mouth, etc., none of us are the same. For example, all humans are members of the same species, Homosapiens, the first upright mammal, but no two individuals are exactly alike. Even identical twins have slight differences in their DNA. For the global population, there are many similarities and differences among people. For example, eye colour and blood type differ among individual Homosapiens. Differences in these traits are due to genetic differences, or genetic variation. The human gene pool carries alternative alleles that affect blood type and many other traits. Other species also have variation in their gene pools. For example, apple trees are all members of one species, but the fruit produced by different trees can be red or yellow, hard or soft, sweet or tart, large or small.