What type of data is recorded by the electrocardiogram?

A. the amount of oxygen in the blood
B. the force from the heart beating
C. the electrical activity of the heart
D. the sound of the heart beating

Option C) the electrical activity of the heart

Explanation:

Electrocardiogram is the visual presentation of the electrical currents associated with heart muscle activity.

It helps in understanding and diagnosis of some irregular heart rhythm and abnormalities

Thus, the data recorded is the electrical activity of the heart

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the answer is tropical areas. the tropical areas obtain more

radiant energy from the sun than they lose to space through terrestrial

radiation, and vice versa for polar areas. earth has an energy remaining in the

tropics and an energy scarcity for the polar areas.

explanation: