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OF ANIMAL LIFE PART ONE 1 Origin and basic molecules of life
The cell as the unit of life
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acetyl-CoA active adapted adaptive radiation adult alleles amino acids amphibians animals annelids aquatic arthropods behavior biological birds blood body bone brain called canal capillaries carbon dioxide cavity cells characteristic chemical chromosomes cilia cnidarians coelom complex concentration contains cord cycle cytoplasm digestive dorsal echinoderms electron embryo energy environment enzymes evolution evolutionary feeding female fibers fishes flatworms fluid freshwater function gametes genes genetic gills glands glucose hormone human insects intestine invertebrates kidney larva layer living lophophore lungs male mammals marine membrane metabolism molecules molluscs mouth muscle nematocysts nephridium nerve nervous system neurons notochord organs osmotic oxidation oxygen pair parasites phyla phylum plants plasma population pressure primitive produce protein protozoa pseudocoel receptors release reproduction reptiles respiratory secreted sensory shell sodium species sperm sponges structure surface synthesis tentacles tissue tube tubules urine usually ventral vertebrates wings worms