Biomes. The two main types of biome are terrestrial (land-based) and aquatic (water-based). The easiest to discuss are the terrestrial biomes since they have a more definite boundary. The different climates of the Earth are governed by their average annual precipitation and temperature.
An electrocardiogram (ECG or EKG) test. An electrocardiogram (ECG or EKG) is a routine test that is used to look at the electrical activity of the heartbeat. An electrocardiogram can tell your doctor a lot about your heart and how it is working.
ECG An electrocardiogram - or ECG - is a simple and useful test which records the rhythm and electrical activity of your heart. What happens in an ECG test? Small sticky patches called electrodes are put on your arms, legs and chest. These are connected by wires to an ECG recording machine which picks up the electrical signals that make your heart beat.