In the pie chart below, which of the following represents the amount of Earth's surface covered by water? A pie chart divided into four sections, labeled A, B, C, and D. Section A includes approximately 71 percent of the chart's area. Section B includes approximately 13 percent of the chart's area. Section C includes approximately 10 percent of the chart's area. Section D includes approximately 1.2 percent of the chart's area.

A only

B only

B and C

D only

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).