Galapagos tortoises have specific modifications that allow them to consume food and survive on the galapagos islands. arrange the steps of the evolution of galapagos tortoises in the correct order. 1.the shrubs were high off the ground and out of reach for the tortoises. 2.this motion gave their shells a saddle-like appearance. 3.the tortoises fed by craning their necks upward. 4.over time, turtles with arched shells and longer necks were more likely to survive. 4.tortoises swam from the mainland to the galapagos islands. 5.they settled in the ecosystem available there.

Choose the incorrect statement (a) the motor end plate membrane is only capable of generating graded potentials, but it is contiguous with the skeletal muscle sarcolemma, which can generate action potentials. (b) propagation of an action potential through the t-tubules into the sarcoplasmic reticulum triggers the release of ca++ into the cytoplasm of a skeletal muscle fiber. (c) the generation of suprathreshold endplate potentials in multiple muscle fibers could be due to the increased frequency of action potential generation at the axon hillock of a single motor neuron. (d) a greater amount of ach would be found in the presynaptic vesicles of a motor unit that fired several action potentials after exposure to botulinum toxin, than in a motor unit that fired several action potentials after exposure to the venom of the krait snake (which contains α-bungarotoxin).