True.
Nitrogen-fixing bacteria, microorganisms capable of transforming atmospheric nitrogen into fixed nitrogen (inorganic compounds usable by plants). More than 90 percent of all nitrogen fixation is effected by these organisms, which thus play an important role in the nitrogen cycle.
The right side of the heart sends blood out to the lungs to become oxygenated and that oxygen-rich blood comes back to the heart on the left side. Then the left side of the heart pumps the oxygenated blood to the rest of the body.
Answer:
Main Concept Seismology is the study of earthquakes, their effects, and seismic waves.
Explanation:
The atria and ventricles work together, contracting and relaxing to pump blood out of the heart in a coordinated and rhythmic fashion. As blood leaves each chamber of the heart, it passes through a valve.
Forms from the water of the cooling ocean as heat is lost into the atmosphere.