The Principles of Biology, Zväzok 1

actions adaptation aggregate alterations Amphibia animals arise arrangement atoms axis become belief birds body carbonic acid cause cells changes classes colloids combination complex compounds Comte conception constituting continuous contrasts creatures crustaceans Darwin definite degree differentiation direct distinct divergence effects embryo environment equilibration ethereal waves evidence exist external facts Faunas fertilized germ functions further gamogenesis genesis geologic greater groups growth habitats habitually Hence heterogeneity higher homogeneous Hydrozoa hypothesis of evolution implies incident forces increase individuals kind less living mammals manifest mass ment modes modifications molecular mobility motion moving equilibrium multiplication natural selection nutriment nutrition offspring organic forms organic matter oviparous ovules ovum parent parthenogenesis peculiar phenomena physiological units pistil plants Positive disintegration produced Protozoa races re-actions re-distribution relations Sciences similarly special creations species sperm-cells and germ-cells stamens structure substances successive tion tissues truth types unlike variations vertebral vertebral column Vertebrata viviparous