. Biology and man. Biology; Human beings. â 1\ i H 1 WiiW B. Alier (Jruenljera. 'J'lie iiluii/ ut Evulution AN INFANT'S RESEMBLANCE TO ITS ANCESTORS The almost shapeless Sacculina (C) growing as a parasite on the abdomen of the crab (D) has nothing in its structure or behavior to suggest a relationship to its host. Yet in its early development (A, B) it seems destined to become an unmistakable crus- tacean. Without a study of its life history we should never have guessed that host and parasite are of the same class of animals Darwin pointed out that similar regions which are occupied by differ
. Biology and man. Biology; Human beings. â 1\ i H 1 WiiW B. Alier (Jruenljera. 'J'lie iiluii/ ut Evulution AN INFANT'S RESEMBLANCE TO ITS ANCESTORS The almost shapeless Sacculina (C) growing as a parasite on the abdomen of the crab (D) has nothing in its structure or behavior to suggest a relationship to its host. Yet in its early development (A, B) it seems destined to become an unmistakable crus- tacean. Without a study of its life history we should never have guessed that host and parasite are of the same class of animals Darwin pointed out that similar regions which are occupied by different flora and fauna are always separated from each other by impassable barriers, such as oceans, mountain ranges, and deserts. On the other hand, when regions which differ markedly in climate, soil, and so on are inhabited by similar plants and animals, they are either directly connected at present or show evidence of having been so connected in the past. For example, the plants and animals found on oceanic islands are frequently quite distinct from 461. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965; Bingham, N. Eldred (Nelson Eldred), 1901-. Boston, New York, [etc. ] Ginn and company
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