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The cells most concerned in this process will become part of the future foregut . ... them being eventually reduced to a narrow canal , which lies at the posterior end of the embryo and , in some species , becomes the anal opening .
In amphibians , cytoplasm at the vegetal pole , rich in ribonucleic acids , becomes incorporated into a number of cells , which ... Later they migrate into the mesodermal layer and become incorporated into the rudiments of the gonads .
Most major groups of plants and periodic torpor ( extreme sluggishness ) —an innate behavanimals have some representatives that can become ioral pattern that operates independently of environmendormant ; more species hibernate than ...
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LibraryThing ReviewUser Review - keylawk - LibraryThing
This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review