What does an electrocardiogram measure? a) sound waves created by the closing of heart valves b) the volume of blood moving through the heart chambers c) the force of muscle contraction in the heart chambers d) action potentials moving through the heart muscle

Which of the following is an example of this type of co-evolution

The fish shown above is a tarpon. it is a fast-swimming and powerful open-water fish. its closest relatives, oddly, are burrow-dwelling conger eels that stay on the bottom. both eels and tarpon developed from snake-like larvae that float in the plankton during the first stages of life. once they mature, tarpon and eels are not found near one another in the ocean. the tarpon and the eel illustrate all of the following except

How do living things obtain phosphorus