A Manual of Elementary Zoology
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Evolution is an alteration of the average characters, either of the whole of a species or of a certain group of its members, from generation to generation in a constant manner, by which they become so different from what they were at first that a new species arises. This theory is now held by all zoologists. It is based upon several classes of evidence.
CLASSIFICATION AND EVOLUTION 521 (1) It is supported by the facts upon which classification is based. Species, genera, families, orders, etc., ...are like the branches of a genealogical tree, and when they are arranged as such suggest strongly that they have arisen by modification each from the preceding grade. By the alteration in different directions of groups of members of a single species, the several species of a genus would arise. As each of these pursued its own line of evolu- tion it would become more unlike its congeners until it reached the rank of a genus, by which time it would generally have given rise to species of its own, and so forth.
What to read after A Manual of Elementary Zoology?
You can find similar books in the "Read Also" column, or choose other free books by Borradaile, L. A. (Lancelot Alexander), 1872-1945 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Evolution is an alteration of the average characters, either of the whole of a species or of a certain group of its members, from generation to generation in a constant manner, by which they become so different from what they were at first that a new species arises. This theory is now held by all zoologists. It is based upon several classes of evidence.
CLASSIFICATION AND EVOLUTION 521 (1) It is supported by the facts upon which classification is based. Species, genera, families, orders, etc., ...are like the branches of a genealogical tree, and when they are arranged as such suggest strongly that they have arisen by modification each from the preceding grade. By the alteration in different directions of groups of members of a single species, the several species of a genus would arise. As each of these pursued its own line of evolu- tion it would become more unlike its congeners until it reached the rank of a genus, by which time it would generally have given rise to species of its own, and so forth.
What to read after A Manual of Elementary Zoology?
You can find similar books in the "Read Also" column, or choose other free books by Borradaile, L. A. (Lancelot Alexander), 1872-1945 to read onlineMoreLess
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