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NOAA Coral Reef Conservation Program, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
An egg cell in which the yolk is not evenly distibuted throughout the cytoplasm, but is concentrated in one location, and cleavage is incomplete, e.g., a bird egg.
Industry:Natural environment
The ciliated planktonic larva of many invertebrates, including polychaete worms, mollusks, and rotifers.
Industry:Natural environment
The middle layer of the Earth, lying just below the crust and consisting of relatively dense rocks. The mantle is divided into the upper mantle and the lower mantle; the lower mantle has greater density than the upper mantle.
Industry:Natural environment
