LIFE SCIENCE

Detailed explanation-1: -The major levels of organization in the body, from the simplest to the most complex are: atoms, molecules, organelles, cells, tissues, organs, organ systems, and the human organism. See below Figure 1.1.

Detailed explanation-2: -Answer and Explanation: The level of cellular organization, from smallest to most complex, is cells, tissues, organs, organ systems, and organisms.

Detailed explanation-3: -Higher levels of organization are built from lower levels. Therefore, molecules combine to form cells, cells combine to form tissues, tissues combine to form organs, organs combine to form organ systems, and organ systems combine to form organisms.