A General Zoology of the Invertebrates |
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acid activity adapted adult annelids arthropods axial organisation beat behaviour blastomeres buds centrosomes changes chemical cilia cilium co-ordination cœlenterates colloidal colony complex conjugation contraction Crustacea cytoplasm differentiation diffusion direction discuss division echinoderm ectoderm effector organs endomixis environment enzymes evidence evolution example excretion excretory external medium feeding fibres flagella flagellum free-living function gradient graft groups growth hæmoglobin impulses increase insects invertebrates larva larvæ life-history light liquid living membrane metabolism Metazoa movement multicellular multicellular animals multicellular body nematocysts nephridium nerve cells nerve-net nervous system normal nucleus occur osculum osmotic pressure oxygen Paramecium parasitic particles pass phyla physiological pigment plain muscle planarians platyhelminths posterior probably produced Protista protoplasm pseudopodia reactions receptor cells regeneration respiratory response result secretion seen segmentation sessile shown similar species specific form sponge statocyst stimulation striped muscle structure substances surface syngamy tion tissues tube vacuole vertebrate whole