Question

Arrange the following biological levels of organisation from the simplest to most complex.

• A. Cell
• B. Tissue
• C. Organ
• D. Organ system
• E. Organism

Answer 1

All living organisms are made up of very small units called cells. Many similar cells combine to form a tissue. Tissues combine to form an organ, organs combine to form an organ system and organ systems come together to form a complete organism.