This is a process where a parent cell divides into four sex cells with half the chromosomes.

Meiosis

Explanation:

Sex cells, or gametes, are haploid (half the number of the parent's chromosomes) cells produced when a single cell divides twice into four in a process called meiosis.

Meiosis happens in two stages, meiosis I, when the first division happens, and meiosis II, when the second division takes place, in the image I added you can see this process in detail.

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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.