How many chromosomes are in a polar bear’s nose

i think the answer would d

name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?

i believe the answer would be b. hope it : )

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.