. Biology; the story of living things. 14 NATURAL HISTORY Animals definitely respond by movement to the stimulus of light, but unlike green plants, some respond positively and others nega- tively. The unicellular Ameba is killed by too much light. Earth- worms and some other animals are definitely repelled by light. The moth, on the other hand, is attracted to light. Although of great importance, light may be injurious to some forms, for bacteria and some animals are killed by long exposure to it. The dangers from certain wave lengths of light are seen in a bad case of sunburn. Light influence
. Biology; the story of living things. 14 NATURAL HISTORY Animals definitely respond by movement to the stimulus of light, but unlike green plants, some respond positively and others nega- tively. The unicellular Ameba is killed by too much light. Earth- worms and some other animals are definitely repelled by light. The moth, on the other hand, is attracted to light. Although of great importance, light may be injurious to some forms, for bacteria and some animals are killed by long exposure to it. The dangers from certain wave lengths of light are seen in a bad case of sunburn. Light influences animals in other ways. Light stimulus coming through the eyes of flounder is said to give rise to changes in the pig- ment of the skin. Thus the surface of the skin takes on the general color and markings of its background. Some animals in caves lack pigment, and there seems to be a general relationship between light and pigment in the skin. There is a day and night rhythm in the lives of many animals. Land snails feed at night, while activities of most birds are confined to the daytime. Bees go to flowers during day- light. Migrations of plankton are influenced by light, many crusta- ceans coming to the surface only at night and going deep down into the water during the A dry alkali lake. Life is practically absent in such areas. why this is so.'> II riiilil I'll rcc Can you explain. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hunter, George W. (George William), 1873-1948; Walter, Herbert Eugene, b. 1867; Hunter, George W. (George William), 1902-. New York, Cincinnati [etc. ] American book company
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