What is a gene? a) a section of a protein that codes for dna b)the alternate version of a trait c)the visible trait in the f1 generation d) a section of dna that codes for a specific trait

D) a section of DNA that codes for a specific trait

Explanation:

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all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex

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.