What level of organization do the following represent:

Skin, arteries, veins, heart

A) Tissue

B) Organ

C) Cell

D) Organ system

The Skin, arteries, veins, heart all represents the organs of the human body.

Answer: Option B

Explanation:

Human body is an embodiment of many cells that make up the entire new organism. Several cells join together and form a tissue, several tissues join together and form an organ, several organs join together and form an organ system.

The structures with similar function join together to form an higher construct. Similarly the above mentioned structures are organs that would combine with other organs to form an organ system. So the given parts of human body is considered as organs here.

I have tuh say organ system ... correct me if im sort of wrong