Sub-concept 1: Some likenesses between offspring and parents are inherited. Other likenesses are learned. For offspring to resemble their parents, there must be a reliable way to transfer information from one generation to the next
Sub-concept 2: Some organisms consist of a single cell (unicellular). Some organisms consist of many cells (multicellular). In complex multicellular organisms, such as the human body, there are differentiated cells that perform specialized functions.
Sub-concept 3: There are many systems in the human body. Each system performs a special life function such as defense, coordination and deriving energy from food.