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actinomycetes activity adapted adult algae alleles amino acids animals appear arctic areas arthropods bacteria biological birds blood body bone carbon carotenoids cavity cells central chemical chitin chromosomes ciliated Cnidaria coelom color complex compounds consists contain Crustacea cytoplasm differentiation diploid dorsal eggs electron embryo energy environment enzymes evolution families female fertilization fishes flowers forms fossil function fungi gametes gametophyte gene genera genetic genus gland growth habitats haploid hormone hyphae individuals insects invertebrates known larvae later layer living male mammals marine mechanism meiosis membrane ment metabolism microscope molecules muscle mutation nature nerve nervous system nuclei occur organisms ovary oxidation pair parasitic physiological pigment plants primitive produced protein reactions References regions reproduction result secretion segments sexual single species sperm spores sporophyte structure studies suborder substances surface tion tissue tropical tubules types University usually vary vegetation vertebrates wall York