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7ourn acid adaptation adult Agricultural allometry Anat animals artiﬁcial associated bacteria behaviour Biol biologists biology blastomeres blood body breeding Brit Cambridge carbon dioxide cells century characters chemical chromosomes classiﬁcation colour concerned copepods corpuscles cytoplasm deﬁned deﬁnite determined difﬁcult discovery disease effect eggs embryo embryology enzymes evolution exist experimental fertilisation ﬁbres ﬁeld ﬁgure ﬁnd ﬁrst ﬁsh ﬁshes function gametes gastrula genes Genetics gland groups growth haemoglobin hormones human Huxley inﬂuence insects instance kinds known laboratory larvae later liquid living locust London mammals membrane metabolism methods Micr microscope modiﬁed molecules molluscs muscle nature nerve nervous nitrogen normal notably nutrition organisation organisms ovum oxygen parasites parthenogenesis Physiol physiology pigment pituitary plankton plants problems Proc produced protein protoplasm Protozoa receptors regard reproduction result scientiﬁc signiﬁcance species speciﬁc sperms structure substances T. H. Morgan theory tissues various vertebrates worms