Demospongea
Demospongea (Demospongiae; phylum Porifera) A class of sponges that first appears in the Cambrian. The soft tissue of the skeleton is supported by siliceous spicules, each spicule consisting of either a single ray (monaxon) or four rays (tetraxon) diverging at 60° or 120°. Most fossil species are represented by their spicules only, but they can usually be referred to modern families.
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Gamma Rays , gamma rays John Ray , Ray, John
RAY, JOHN
natural history.
Ray may have acquired his interest in science during his early years at Black Notley, where his father, Roger Ra… Ray , ray1 / rā/ • n. 1. each of the lines in which light (and heat) may seem to stream from the sun or any luminous body, or pass through a small opening:… Crepuscular Rays , crepuscular rays
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ETHNONYM: Raji
Along with the Limbu, the Rai form the two subgroups of the Kiranti. The largest Tibeto-Nepalese group in eastern Nepal, the Rai a… Gamma-ray Astronomy , Gamma-ray Astronomy
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Gamma-ray astronomy is the study of gamma rays within the universe. Beginning in the 1940s and 1950s astronomers and ot…
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Demospongea
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Demospongea