Carbon has a mass number of 12 and atomic number of 6, therefore carbon has (click ALL that apply)
O 6 neutrons
O 4 electrons in its outer shell
O 12 protons & 6 electrons
O 6 electrons & 6 protons

gametes or germ cells are haploid cells (example: sperm and ova) containing only one set (or n) number of chromosomes and autosomal or somatic cells are diploid cells containing 2n number of chromosomes.

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.