Introductory Biology |
From inside the book
Results 1-3 of 70
Page 652
... soil . Here in America , however , the conditions were entirely different . On the cleared forest areas or the plowed under grasslands the soil was virgin . Crops grew vigorously , and the harvests were abundant . Corn was grown in the ...
... soil . Here in America , however , the conditions were entirely different . On the cleared forest areas or the plowed under grasslands the soil was virgin . Crops grew vigorously , and the harvests were abundant . Corn was grown in the ...
Page 661
... soil washed from it might cover up good farm land farther down the slope . Soil Conservation in Practice . It has been previously mentioned that the growing of legumes would replenish the humus on continu- ously cropped soils and that ...
... soil washed from it might cover up good farm land farther down the slope . Soil Conservation in Practice . It has been previously mentioned that the growing of legumes would replenish the humus on continu- ously cropped soils and that ...
Page 662
... soil and put each acre to its best use . The preferences of the farmer as well as his individual needs are taken into consideration , for , after all , the plan must be a practical one : the farmer must make a living . If the proposal ...
... soil and put each acre to its best use . The preferences of the farmer as well as his individual needs are taken into consideration , for , after all , the plan must be a practical one : the farmer must make a living . If the proposal ...
Contents
INTRODUCING LIVING ORGANISMS | 2 |
HOW ORGANISMS SECURE FOOD | 14 |
A BALANCED DIET FOR MAN | 24 |
Copyright | |
60 other sections not shown
Common terms and phrases
alleles amino acids arteries auricle auxin bacteria birds blood cells blood vessels body bones brain called capillaries carbon dioxide cavity chemical chlorophyll chromosomes clot coelom color contraction cord cytoplasm diffusion digestive disease earthworm embryo energy enzymes factors fats fibers flow fluid forest function gametes gametophyte genes glands glucose grow growth hair heart hemoglobin hormones human hybrid hydra impulses increase infection intestine kidneys known layer leaves living lungs lymph mammals materials mechanism membrane metabolism molecules muscle muscular nerve nervous system neurons normal occur organisms oxidation oxygen pair phloem photosynthesis plasma pressure produce proteins protoplasm receptors reproductive respiratory result root salts seed sex organs skin soil species sperms spinal spores sporophyte starch stem stimulation structure substances sugar supply surface synthesis teeth temperature tion tissue tract trees tube tubules vacuole valves veins ventricle vertebrates vitamin walls xylem