During the summer in the Arctic, mosquitoes reproduce exponentially. With the coming of winter, the population decreases significantly due to a limiting factor. What is this limiting factor

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.

her affection for her parents makes her an especially sympathetic character.