Answer:
(D) Cardiovascular system
Biology Concepts:
Blood cells are any of the cellular elements of the blood, as white blood cells or red blood cells.
Tissues are a aggregate of similar cells and cell products forming a definite kind of structural material with a specific function, in a multicellular organism.
The Lung is either of the two saclike respiratory organs in the thorax of humans and the higher vertebrates.
The Cardiovascular System/Circulatory System is the system of organs and tissues, including the heart, blood vessels, blood, lymph, lymphatic vessels, and lymph glands, involved in circulating blood and lymph through the body.
The cardiovascular system consists of the heart, blood vessels, and blood, and is responsible for circulating blood throughout the body. It is a higher level of organization than a blood cell, which is a component of the blood, lungs, which are an organ within the respiratory system, and nerve tissue, which is a component of the nervous system.
Biological organization is generally viewed as a hierarchy, with lower levels of organization building upon each other to create higher levels of complexity. At the highest levels of organization, multiple organ systems work together to maintain the overall function of the organism. Therefore, the cardiovascular system, which is a complex system made up of multiple organs and tissues, represents a higher level of organization than the other options provided.