In a closed circulatory system, oxygen and nutrients are exchanged directly between the cells and the environment. true or false

False. In an open circulatory system is when the cells are in direct contact with the environment. Take our bodies for example, we breath into our lungs and the blood carries oxygen to our cells and tokes the waste away from the cell making it a closed circulatory system

"a.) well–developed vascular system."

i think it’s c but i might be wrong. if i am let me know! have a good rest of your day as well!