Discuss the sources and expression of variability.

Variability, which is crucial for the process of evolution and the diversification of life forms, arises from multiple sources and can be expressed in different forms. The primary sources of variability include mutations, genetic recombination, and environmental influences.

Mutations are spontaneous alterations in the DNA sequence that can occur due to errors in replication, exposure to radiation, chemicals, or other external ______ _____ _______ _______ ______ _____ __________ ________ _______ ____ ________ _________.
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