. Principles of modern biology. Biology. 634 - Heredity and Evolution. Fig. 32-10. Skeletal supporting and attaching structures of various coral animals. Coral reefs are built mainly of such structures, which may accumulate enormously through the years. (Courtesy of Ward's Natural Science Establishment.) nant role in the building of coral reefs. Undoubtedly the greatest of all coral reefs is the Great Barrier Reef, which extends more than a thousand miles along the northeast coast of Australia, at varying distances up to about 80 miles offshore. However, smaller coral reefs are very common in
. Principles of modern biology. Biology. 634 - Heredity and Evolution. Fig. 32-10. Skeletal supporting and attaching structures of various coral animals. Coral reefs are built mainly of such structures, which may accumulate enormously through the years. (Courtesy of Ward's Natural Science Establishment.) nant role in the building of coral reefs. Undoubtedly the greatest of all coral reefs is the Great Barrier Reef, which extends more than a thousand miles along the northeast coast of Australia, at varying distances up to about 80 miles offshore. However, smaller coral reefs are very common in South At- lantic and South Pacific regions. Layer after layer of calcareous deposits, representing countless generations of living animals, tend to accumulate in the warm shallow offshore waters, at a rate (measured under present-day conditions) varying from 5 to 200 millimeters annually (see Fig. 32-1 1). Phylogeny of the Coelenterata. Coelen- terate fossils extend back into formations of early Cambrian period—which demonstrates a very ancient origin. Also the embryological pattern and other evidence indicate that some of the early Coelenterata represent a main line in the evolutionary ascent of all major groups of higher animals (Fig. 29-11). THE CTENOPHORA (LITERALLY, COMB BEARERS) The animals in this small group (only SO species) of exclusively marine forms resemble. 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 Marsland, Douglas, 1899-. New York, Holt, Rinehart and Winston
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