Describe what hereditary is and how it works in mice

Heredity is the inheritance of genes from parent "mice" to their offspring. ... mice have 20 SETS of chromosomes, making 40 chromosomes overall. Each chromosome may not have the same form of allele as the next, since one pair came from the mother and onother the father.

Explanation:

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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.