Evolution and Animal Life: An Elementary Discussion of Facts, Processes, Laws and Theories Relating to the Life and Evolution of AnimalsD. Appleton, 1907 - Всего страниц: 489 |
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actual adaptation adult animals animals and plants ants apes appear artificial selection bees beetles biological biologists birds body breeding butterfly called causes centrosome changes CHAPTER characters chromatin chromosomes color and pattern common crab Darwin degeneration degree descent differentiation division egg cell embryo environment existence fact factors fauna female fertilized fishes forms fossils gastrula genus germ cells habit hatched heredity host hybrid individuals influence inheritance insects instinct islands isolation kinds of animals known larva larvæ live lower male mammals matter ment modified mutations natural selection naturalists nest nucleus offspring organic evolution origin Origin of Species parasites parent phenomena plasm primitive produced protoplasm Protozoa race relation reproduction resemblance Sacculina sea anemone sexual sexual selection sheep simple species species-forming sperm spines stage structure substance tail theory tion traits tree variation various vertebrates Weismann wings workers worm young