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Once evolved, anisogamy and the two sexes are evolutionarily very stable. Free aerobiology books download ebooks online textbooks. Click now to download free pdf of ncert class 9th books of all subjects in both english and hindi language. Anisogamy also called heterogamy is the form of sexual reproduction that involves the union or fusion of two gametes, which differ in size andor form. The common forms are ectocarpus, dictyota, laminaria, sargassum and fucus figure 3. Blackwell, 2001 article pdf available in russian journal of developmental biology 366.