Which level describes the smallest living units in the body?

Which level describes the smallest living units in the body?

• A. Cellular level of organization
• B. Tissue level of organization
• C. Organ level of organization
• D. System level of organization

Answer: (A)

Cells are the basic units of life, capable of carrying out the essential processes that keep an organism alive. Because a cell is the smallest unit that can perform metabolism, growth, and reproduction, the cellular level describes the smallest living units in the body. When similar cells group together, they form tissues; tissues join to create organs; and organs integrate into organ systems. These levels show increasing complexity, so the cellular level is the correct description of the smallest living units.

Cells are the basic units of life, capable of carrying out the essential processes that keep an organism alive. Because a cell is the smallest unit that can perform metabolism, growth, and reproduction, the cellular level describes the smallest living units in the body. When similar cells group together, they form tissues; tissues join to create organs; and organs integrate into organ systems. These levels show increasing complexity, so the cellular level is the correct description of the smallest living units.