W

water molds A diverse group of eukaryotes with cellulose cell walls that can aggregate into multinucleated forms. 458

water vascular system WA-ter VAS-ku-ler SIS-tem System of canals in echinoderms that admits seawater. 524

wavelength The distance a photon moves during a complete vibration. 147

whisk fern The simplest type of seedless vascular plant. 497

white blood cell A cell that helps fight infection. 594, 714

wild-type The most common phenotype or allele for a certain gene in a population. 265

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