The Physical Basis of SocietyD.Appleton, 1928 - 526 من الصفحات |
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الصفحة 58
... eggs or sleep in larval form . Birds migrate to find new sources of food . Bears hibernate . There are physiological changes as well as changes in habits . A frog is lively in warm water but becomes sluggish and drowsy as the ...
... eggs or sleep in larval form . Birds migrate to find new sources of food . Bears hibernate . There are physiological changes as well as changes in habits . A frog is lively in warm water but becomes sluggish and drowsy as the ...
الصفحة 98
... eggs and has twelve generations a season at Wash- ington , D. C. It breeds chiefly in horse manure where it has been ... eggs , a 75 - pound cod has 9,100,000 eggs and a giant ocean sunfish ( Mola ) is said to have contained 300 ...
... eggs and has twelve generations a season at Wash- ington , D. C. It breeds chiefly in horse manure where it has been ... eggs , a 75 - pound cod has 9,100,000 eggs and a giant ocean sunfish ( Mola ) is said to have contained 300 ...
الصفحة 100
... eggs , pro- ducing 500 caterpillars , 498 are destroyed in some way .... The important thing is that a species ... egg stage to death , and by no means stopping there , every organism is preyed on by some , not by all others about ...
... eggs , pro- ducing 500 caterpillars , 498 are destroyed in some way .... The important thing is that a species ... egg stage to death , and by no means stopping there , every organism is preyed on by some , not by all others about ...
الصفحة 102
... eggs which pass out of the sheep and fall to the ground . The rain washes them into pools and ponds where they hatch , giving forth an active conical creature , exceedingly small , which swims about until it finds a snail , into which ...
... eggs which pass out of the sheep and fall to the ground . The rain washes them into pools and ponds where they hatch , giving forth an active conical creature , exceedingly small , which swims about until it finds a snail , into which ...
الصفحة 108
... eggs . Some- how we do not like to find instances where the parents eat , destroy , or neglect their offspring in order to care for foster infants imposed upon them , yet , such there are . Many fish eat the young of their own species ...
... eggs . Some- how we do not like to find instances where the parents eat , destroy , or neglect their offspring in order to care for foster infants imposed upon them , yet , such there are . Many fish eat the young of their own species ...
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acres Africa America appears areas Asia atoms average bacteria believe birds body carbon carbon dioxide cause cent century cephalic index changes characters chromosomes civilization climate color common copper crops cultivated culture danger Darwin death rate destroy disease domestic early earth eggs environment Europe European evidence fact feeble-minded females fish forms germ cells given heredity human Ibid important increase Indians individual inheritance insane insects iron killed known land later light living male man's marriage metals miles natural selection nature Negro neolithic organisms ovum oxygen Pará rubber tree parasites physical population possible pounds present problems produced R. S. LULL race seeds seems social South South America species square mile supply T. H. MORGAN temperature things thousand tion to-day trees tropics types United wild woman women