Evolution and animal life, an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animalsD. Appleton, 1908 - 489 páginas |
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Página 59
... hatched and the conger grew to maturity , in a few years there would be no room for any other kind of fish in the sea . The codfish has been known to produce 9,100,000 eggs each year . If each egg were to develop , in ten years the sea ...
... hatched and the conger grew to maturity , in a few years there would be no room for any other kind of fish in the sea . The codfish has been known to produce 9,100,000 eggs each year . If each egg were to develop , in ten years the sea ...
Página 223
... hatching , as we are accustomed to call such appearance ) —it has already undergone a longer or shorter period of life . It has been a new living organism hours or days or months , perhaps , before its appearance to us . This period of ...
... hatching , as we are accustomed to call such appearance ) —it has already undergone a longer or shorter period of life . It has been a new living organism hours or days or months , perhaps , before its appearance to us . This period of ...
Página 226
... hatched , and other thousands of the defense- less young fish are eaten long before attaining maturity . Of the great number produced by the parent , a few only reach maturity and produce new young . But the eggs of the robin are hatched ...
... hatched , and other thousands of the defense- less young fish are eaten long before attaining maturity . Of the great number produced by the parent , a few only reach maturity and produce new young . But the eggs of the robin are hatched ...
Página 227
... hatching is not yet fully devel- oped . of its development or period of im- maturity is passed within the egg or within the body of the mother . That part of its life thus passed within the Only part a f و h FIG . 134. First stages in ...
... hatching is not yet fully devel- oped . of its development or period of im- maturity is passed within the egg or within the body of the mother . That part of its life thus passed within the Only part a f و h FIG . 134. First stages in ...
Página 229
... hatched has most of the tissues and organs of a full - grown fowl , and is simply a little hen . But in the case of other animals the young hatches from the egg before it has reached such an advanced stage of development ; a young ...
... hatched has most of the tissues and organs of a full - grown fowl , and is simply a little hen . But in the case of other animals the young hatches from the egg before it has reached such an advanced stage of development ; a young ...
Outras edições - Ver tudo
Evolution and Animal Life: An Elementary Discussion of Facts, Processes ... David Starr Jordan,Vernon Lyman Kellogg Visualização integral - 1907 |
Evolution and Animal Life: An Elementary Discussion of Facts, Processes ... David Starr Jordan,Vernon Lyman Kellogg Visualização integral - 1907 |
Evolution and animal life, an elementary discussion of facts, processes ... David Starr Jordan,Vernon Lyman Kellogg Visualização integral - 1907 |
Palavras e frases frequentes
actual adaptation adult animals animals and plants ants apes appear artificial selection bees beetles 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 genus germ cells habit hatched heredity honeybee 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 reptiles resemblance Sacculina sea anemone sexual sexual selection sheep species species-forming sperm spines stage structure substance tail theory tion traits tree variation various vertebrates Weismann wings workers young