Describe the regions where the process of crystallization happens
most often

In polar regions vapor deposition is the primary method of crystal growth in the upper fairing

Explanation:

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rain is the best answer

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.