What is a compound action potential? Group of answer choices a single neuron's action potential as visualized by the EMG a single muscle cell's action potential visualized with the EMG the algebraic sum of multiple cells' action potentials recorded by the EMG the sum of a nerve cell action potential and a muscle cell action potential

12) several teeth were found in an area of flat land covered with trees and plants. the teeth were examined by a paleontologist, and it was determined that the teeth came from a shark. they found many other shark teeth in this area. however, the people who discovered the teeth were puzzled, because there was no source of water near where the fossils were found. what is the paleontologist's best explanation for why the teeth were found in this area? a) sharks used to live on flat land. b) this area was once covered with salt water. c) this area was once covered with freshwater. d) someone buried the shark teeth deep in the ground.