Evolution: The Way of Man |
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Page 34
... polyps , whose stinging tentacles help repel any crab enemies . The polyps get the advantage of being carried about and of sharing bits of food from the finds made by the crab . This is an example of a form of interrelation between two ...
... polyps , whose stinging tentacles help repel any crab enemies . The polyps get the advantage of being carried about and of sharing bits of food from the finds made by the crab . This is an example of a form of interrelation between two ...
Page 36
... polyps , called by the older naturalists " plant animals , " although they are true animals , resembling plants only in general appearance when in their fixed , adult condition . These animals have a very simple body composed of a sort ...
... polyps , called by the older naturalists " plant animals , " although they are true animals , resembling plants only in general appearance when in their fixed , adult condition . These animals have a very simple body composed of a sort ...
Page 37
... polyps , which produce the extensive coral reefs of tropic and subtropic oceans , are sea anem- ones of a special kind that secrete a hard skeleton of lime salts which is the dead substance we know as coral . We can find still simpler ...
... polyps , which produce the extensive coral reefs of tropic and subtropic oceans , are sea anem- ones of a special kind that secrete a hard skeleton of lime salts which is the dead substance we know as coral . We can find still simpler ...
Page 163
... polyps . Like the corals , too , they secrete a calcareous skele- ton and help to build the coral reefs . Some of them have been found as fossils in rocks as old as those of the Silurian Age . But these marine green algæ are specialized ...
... polyps . Like the corals , too , they secrete a calcareous skele- ton and help to build the coral reefs . Some of them have been found as fossils in rocks as old as those of the Silurian Age . But these marine green algæ are specialized ...
Page 177
... polyps , corals , sea anemones and jellyfishes . Most of them live in the ocean ( a few in fresh water ) and , like the sponges , are fixed in the adult stage , and somewhat resemble plants in EVOLUTION OF INVERTEBRATES 177.
... polyps , corals , sea anemones and jellyfishes . Most of them live in the ocean ( a few in fresh water ) and , like the sponges , are fixed in the adult stage , and somewhat resemble plants in EVOLUTION OF INVERTEBRATES 177.
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adaptation adult algæ American amphibians animal kinds animals and plants anthropoid apes aquatic artificial selection behavior biological evolution biologists birds blood body bones brain branches brate called cavity chapter character cocoons colonial color Cro-Magnon Darwin distribution earth echinoderms egg cells embryo environment evidence evolution idea evolutionary existence explanation of evolution fact factors ferns fishes flowering plants fossils fundamental geologic golden gradatory heredity higher human evolution human future individuals insects islands Lamarck lancelet land larvæ living creatures lowest lution make-up mammals man's mind modified mollusks Monterey pine natural selection naturalists notochord ocean offspring one-celled organs paleontology parents pine plants and animals polyps prehistoric present produced Protozoa races reptiles rocks sea anemones sea urchins segments shell similar skeleton social inheritance societal evolution species sponges stages starfish structure swimming tion to-day trait trees types variations variety various vertebrates wings young