ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Plant evolution. Conceptual computer artwork of plant evolution. Two molecules of DNA (deoxyribonucleic acid) are emerging from plant cells (bottom) and joining together (upper centre). DNA contains sections, called genes, that encode an organism's genetic information. Random changes in the sequence of DNA over generations can lead to advantageous changes in the physiology of an organism (evolution). These changes may lead to speciation, the evolutionary formation of a new biological species.
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