I will give you the brainiest answer
(Score for Question 1: ___ of 2 points)

1. What is a biome?

(Score for Question 2: ___ of 4 points)

2. Compare the biomes of North Africa and Iceland. Why are they different?

(Score for Question 3: ___ of 4 points)

3. Compare the biomes of New York City and Seattle. Why are their biomes different?

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.

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.