Answer: Your upper and lower arms are connected at your elbow by a hinge joint between your humerus and ulna.
Explanation:
Trace fossils include footprints, trails, burrows, feeding marks, and resting marks. Trace fossils provide information about the organism that is not revealed by body fossils. Trace fossils are formed when an organism makes a mark in mud or sand.
Answer:
C
Explanation:
In BP, an autoantibody binds to a component of the skin that holds the dermis and epidermis together, causing separation of these two layers, thus forming a blister.
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When a nerve impulse reaches the end of an axon, the axon terminal released ACh into the synaptic cleft. 2. ACh diffuses across the cleft and attaches to the ACh receptors on the sarcolemma of the muscle fiber. 3. ACh binding triggers electrical events that ultimately generate an action potential.
