I would say pelagic isn't a zone of ponds and lakes. A pelagic zone is more a zone of the sea rather than ponds and lakes.
Answer: Aorta
Explanation: The aorta is the largest artery in the body. It carries oxygenated blood from the left ventricle of the heart into systemic circulation. The aorta has many subdivisions that branch off into smaller arteries.
A relationship among alleles where both alleles contribute to the phenotype of the heterozygote is codominance.
This is a phenomenon when both alleles are fully expressed. As a result, offspring will have a phenotype that is neither dominant nor recessive, it is combination of both. For example, if one allele contributes to white color of flower, another allele contributes to red color, the offspring (if we cross those two flowers) will have pink flowers (both phenotypes expressed).