Oxygen-rich blood returns from the lungs to the heart. Which two systems are most directly involved in this process

Ihaven't done that yet, so no idea,but this is not the right place to ask

The main role of dna in the  cell is the long-term storage of information. it is often compared to a blueprint, since it contains the instructions to construct other components of the  cell, such as  proteins  and rna molecules.the main function of rna is to carry information of amino acid sequence from the genes to where  proteins  are assembled on  ribosomes  in the  cytoplasm. mark brainliest, my work is good.

Ibelieve the answer is a-broad because that is a leafed plant.

Yes yes yes very good