Question

put the following in their correct order of complexity (from simplest to most complex, with 1 being the simplest and 5 being the most complex)? white blood cell (cell) epithelium (tissue) the heart (organ) central nervous system (organ system) human (organism)

Explanation:

Step1: Recall biological organization hierarchy

In biology, the hierarchy from simplest to most complex is cell - tissue - organ - organ system - organism.

Step2: Match items to hierarchy

White blood cell is a cell, so it is the simplest (1). Epithelium is tissue, so it is next (2). The heart is an organ, so it is 3. The central nervous system is an organ system, so it is 4. Human is an organism, so it is 5.

Answer:

White blood cell (cell): 1
Epithelium (tissue): 2
The heart (organ): 3
Central nervous system (organ system): 4
Human (organism): 5