Their numerical dominance, often exceeding a million individuals per square meter and accounting for about 80% of all individual animals on earth, their diversity of life cycles, and their presence at various trophic levels point at an important role in many ecosystems.
Dominasi numerik mereka, sering melebihi satu juta individu per meter persegi dan terhitung sekitar 80% dari semua individu binatang di bumi, keragaman daur hidup mereka, dan kehadiran mereka di berbagai tingkat tropik menunjuk pada peran penting dalam banyak ekosistem.