Why are traditional sources of energy like coal harmful to the planet

Coal contains sulfur and other elements, like dangerous metals (mercury, leads, and arsenic) that get into the air when coal is burned. Burning coal releases particulates and cause an increase in air pollution, it also emits the amount of CO2 (carbon dioxide) in the atmosphere

telophase and anaphase

the tricuspid valve is present between right atrium and right ventricle