Elementary biology; an introduction to Elementary biology; an introduction to the science of life elementarybiolog00grue Year: 1924 CHAPTER LXIX PROTECTIVE ACTIVITIES 411. Home-making. When the earthworm burrows into the ground, it thus escapes the birds and other enemies; but the burrowing is essentially a process of food getting, for the animal feeds by swallowing dirt as it digs along, and absorbing from it organic material left by decaying plant and animal matter. In the same way, the larva? of various insects and many adult beetles es- cape their ene- mies by boring into trees. In the si
Elementary biology; an introduction to Elementary biology; an introduction to the science of life elementarybiolog00grue Year: 1924 CHAPTER LXIX PROTECTIVE ACTIVITIES 411. Home-making. When the earthworm burrows into the ground, it thus escapes the birds and other enemies; but the burrowing is essentially a process of food getting, for the animal feeds by swallowing dirt as it digs along, and absorbing from it organic material left by decaying plant and animal matter. In the same way, the larva? of various insects and many adult beetles es- cape their ene- mies by boring into trees. In the simplest of animals, where all the activities of life center in the protoplasm of a single cell, the movements related to protection or escape from injury are hardly to be distinguished from the activities related to the getting of food. The simple life will cover all of its necessities by a few acts. But with higher animals it is often difficult to draw a 368 Fig. 1S6. The piddock This mollusk grinds its way into the rock, growing larger as it digs deeper, so that in the end it is completely imprisoned
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