Answer: Arsenic (33As) has 33 known isotopes and at least 10 isomers. Only one of these isotopes, 75As, is stable; as such, it is considered a monoisotopic element. The longest-lived radioisotope is 73As has a half-life of 80 days.
Explanation:
Its is oceans because it stores more water
Letter a is the answer i think
<span>A _ consists of all the genes, including the alleles for each gene, that are present in a population.</span>