Which statement correctly distinguishes between a closed circulatory system and an open circulatory system?

an open system does not have vessels, but a closed system does.

a closed system does not have vessels, but an open system does.

blood does not leave the vessels in a closed system.

blood does not leave the vessels in an open system.

An open system does not have vessels, but a closed system does.

Explanation:

A closed circulatory system is the one which has blood vessels like arteries, veins, and capillaries for circulation of blood while an open circulatory system is the one in which there are no blood vessels to carry blood and the blood runs freely in the body cavity known as hemocoel. In open circulatory system the tissues are in direct contact with a blood-like fluid known as hemolymph. Evolutionarily, closed circulatory system is considered more advanced and advantageous as compared to open circulatory system. Advanced animals like mammals have closed circulatory system while lower organisms like arthropods (insects) and some mollusks (snails, clams) have open circulatory system.

answer: national resource conservation services

national resource conservation services is the us. based approach that provides technical and financial assistance for natural resource management. nrcs society in conservation of resources by involving in activities like farmland protection, flood prevention, watershed protection, urban conservation, conserves economic and environmental conditions. it conducts soil surveys and implements the policy of natural resources management on the society.

the correct answer is d