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Grasslands typically lack trees because seedlings have difficulty surviving the
Genes
Sequences of DNA that contain the instructions to build and maintain an organism's cells and pass traits to offspring.
Percent
A measure or ratio expressed as a fraction of 100.
Sex Chromosomes
Chromosomes that determine the sex of an organism, commonly referred to as X and Y chromosomes in many species.
Female Mammals
Members of the mammalian species characterized by the possession of mammary glands with which they feed their young, and typically possessing two X chromosomes.
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