Carbon atoms are able to: give off electrons to form negative carbon ions bond with other carbon atoms to form long chains gain four extra electrons to form positive carbon ions form five single covalent bonds with their valence electrons Will give brainliest to first person

B

Explanation:

Cuz carbon atoms bond with other carbon atoms to form long chains

c

explanation:

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.