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.

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.