Shell

Shell structure
Eggs are usually smooth, but there are exceptions. A cormorant's egg, for example, is quite rough and is very chalky. In contrast, tinamous have very shiny eggs, and ducks have oily and waterproof eggs.
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Shells are subdivided into orbitals. An orbital can hold 2 electrons.
The first shell has one spherical orbital.
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shell The calcium carbonate outer layer of cnidarians, molluscs, and other animals. Produced by mucous glands.
shivering thermogenesis The generation of heat by shivering, especially within the animal body.
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shell
Any hard outer covering, such as the carapace of turtles and tortoises, the exoskeleton of crustaceans, the calcareous plates of echinoderms, the outermost membranes of an egg, the skeleton of Forminifera, and the mantle secretions of mollusks.
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A shelled egg is just as impervious to sperm as to water, so its arrival coincided with the development of internal fertilization.
The embryo developing within the egg produces 4 extraembryonic membranes: the ...
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A shelled, water-retaining egg that enables reptiles, birds, and egg-laying mammals to complete their life cycles on dry land.
amoeboid
[Gk. amoibe, change] ...
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Snail Shells, Giant Apple Snail & Others. Pretre, J. G. 1850 Animal Kingdom: Vintage Illustration from the Lycos Image Gallery.
The Class Bivalvia ...
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test -- n. A hard shell produced by some unicellular protists; may be made of calcium carbonate, silica, or sand grains.
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[L. cortex - outer shell, bark]. The outermost layer of an organ or the outer, less fluid cytoplasm of an egg.
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chylomicron A plasma lipoprotein composed of a triacylglycerol core and a shell of protein and phospholipid. The chylomicron carries lipid from the intestine to the tissues.
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At least that's the case for species that have hard parts, like vertebrate animals, animals that have bones or shells like mollusks.
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A complete suite of programs forexperiment design, entry of experimental data, and data analysis hasbeen built into the UNIX C-shell in order to facilitate the writingof C-shell scripts for these functions.
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To pick a somewhat ridiculous example, a steel shelled turtle might be an improvement over regular turtles.
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This `dark side' of oxygen relates directly to the fact that each oxygen atom has one unpaired electron in its outer valence shell, and molecular oxygen has two unpaired electrons.
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Most molluscs have calcareous shells and as they grow, the diameter of the shell is enlarged without altering its shape. On the other hand, arthropods shed their exoskeletons to grow, a process known as molting (or ecdysis).
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Founded circa 900, it contains a shell midden 6 acres (24,000 m²) in size and 14 feet (4 m) deep. It was the site of the February 26, 1860 massacre of the Wiyot people that was recorded by Bret Harte, then living in Arcata.
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wing. Extension of the nut shell at the suture line; varies in size according to cultivar.
winter planting. A system of planting strawberries in mid to late fall that depends on growth during winter months for production of an early spring crop.
X ...
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sheetlike tissue in clams, oysters and snails that secretes shell
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
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In birds and reptiles, the membrane adheres to the shell and is highly vascularized to serve in gas exchange.
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