Is evolution Darwinian or/and Lamarckian?

QT:{{”
Various forms of stress-induced mutagenesis are tightly regulated and comprise a universal adaptive response to environmental stress in cellular life forms. Stress-induced mutagenesis can be construed as a quasi-Lamarckian phenomenon because the induced genomic changes, although random, are triggered by environmental factors and are beneficial to the organism.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2781790/

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