A First book in Geology Designed for the Use of Beginners
The book A First book in Geology Designed for the Use of Beginners was written by author Shaler Nathaniel Southgate Here you can read free online of A First book in Geology Designed for the Use of Beginners book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A First book in Geology Designed for the Use of Beginners a good or bad book?
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Nearly all of them can crawl. Besides, these, we now Fig. 74. Common Clam, with siphon protruded. have something like a head to the animal. There are structures that do the work of eyes, and feelers that serve for the sense of touch, and perhaps organs that convey the sense of hearing, all gathered about the front end of the body. Fig. 75. Sea Snail. This group of snail-like, single-shelled gasteropod mol- lusks is also interesting for the fact that it gives us the lowest animals that are able ...to live upon the land. All the forms of animal life below this level are limited to the 170 A SKETCH OF THE EABTH'S ORGANIC LIFE. water. There are several reasons why the lower mollusks cannot come upon the land. Their bodies are all very soft, and have no skin to keep the water from evapor- ating in the air. Then, except some of the bivalve shells, they have no organs for creeping. When they move at all, they only float in the water, helping themselves a little, as the jelly-fish does, by flapping the projections of the body.
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