They do not have a distinct head and thorax but a fused version of the two called a cephalothorax. That's one of the major differences between insects and crustaceans, both being subgroups of arthropods.
Oxytocin is given to women who have a prexisting condition, like diabetes to inhanse labor or for women whose babies re at risk during labor. the staff looks for irregular heart rythem in the fetus that would indicate fetal stress..
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Enzymes contain a globular protein part called apoenzyme and a non-protein part named cofactor or prosthetic group or metal-ion-activator.
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Nitrogen about 77 percent of the atmosphere is composed of nitrogen
