The European Union has stringent regulations over the production of genetically modified crops. Before a GMO can be planted for agriculture, the European Food Safety Authority grants authorization based on scientific evidence that shows there is no risk of an environmental hazard. This is an example of

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when it is at an intermediate population density

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.