The book Animal Life And Human Progress was written by author Arthur Dendy Here you can read free online of Animal Life And Human Progress book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Animal Life And Human Progress a good or bad book?
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It was not that the highest invertebrates became the progenitors of the vertebrates, but that the two stocks arose in common from so simple a form of life as the hydra, and branched off, each along the line to which its definite structural bias had committed it. The middle portion of the scale of life has afforded an object of special study for the zoologist and the palaeontologist. Here, again, all the evidence gained from patient researches upon the phylogeny of the main groups of the vertebr...ates has altogether discredited any belief in " end on " evolution. Multiserial evolution, by which many stocks arise and diverge along their own line, is the order of development, rather than the transition of one group into its next higher neighbour. To take a very obvious example, it is not the highest reptile, not the most perfected expression of reptilian development, that leads the way to the lowest member of the group above, but the lowest reptile, the least developed and differentiated member of its phylum, which makes a bond with other phyla.
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