A genetic mutation is a permanent modification in the DNA sequence of a gene to what is found in most people.
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Seedless vascular plants are plants that contain vascular tissue, but do not produce flowers or seeds. In seedless vascular plants, such as ferns and horsetails, the plants reproduce using haploid, unicellular spores instead of seeds.
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Population density is the number of individuals per unit geographic area, for example, number per square meter, per hectare, or per square kilometer.
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