In order for something to be considered a skeleton, it must contain bone or some other hard substance.
Answer the following statement true (T) or false (F)
False
A skeleton is any structure that provides support and protection and also functions in locomotion. Skeletons are not necessarily composed of hard bone. Three types of skeletons are found in animals. In hydrostatic skeletons, found in many soft-bodied invertebrates, muscle contractions create differences in hydrostatic pressure that support the body and generate movements. In arthropods, exoskeletons are protective external structures that must be shed to accommodate growth of the animal. Endoskeletons-found in some species of sponges and all echinoderms and vertebrates-are internal structures that grow with the animal but do not protect its body surface.
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An antagonist to a receptor decreases the number of messengers bound to the receptor.
a. true b. false
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