Non contact- gravitational force, magnetic force, electrical force, nuclear force, electrostatic, electromagnetic, muscular <span>movements, x-rays, radio waves, infrared, and visible light.</span>
Answer:
S-T segment of ECG shows ventricles contraction.
Explanation:
The ECG is used to measure the electrical signals that controls the contraction and relaxation of heart, most commonly known as heart rhythm. S-T segments are the region after the QRS wave in ECG which is further followed by T waves. The S-T segment is generally shown as a straight line as no electrical signal pass through it and this is the time when ventricles contraction in the heart takes place.
<span>average temperature and precipitation are the two characteristics used to describe the climate of an area</span>
Answer:
photosynthesis
Explanation:
it's how plants produce energy
Answer:
It's important for a scientist to try to hold all variables constant except for the independent variable. If a control variable changes during an experiment, it may invalidate the correlation between the dependent and independent variable. When possible, control variables should be identified, measured, and recorded.
