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Remember, "skeletons" include bone, the protein shell of crabs or insects, the sturdy ... This mineral makes up the bones and teeth of vertebrates and the shells of ... Some organisms make skeletons of large calcite crystals, as in belemnoids and ... organism were compressed and heated, driving off all the volatiles (H, N, O).
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Depression (major depressive disorder) is a common and serious medical illness that negatively affects how you feel, the way you think and how you act. Fortunately, it is also treatable. Depression causes feelings of sadness and/or a loss of interest in activities you once enjoyed. It can lead to a variety of emotional and physical problems and can decrease your ability to function at work and at home. Depression can affect anyone—even a person who appears to live in relatively ideal circumstances.
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