Enduring understandings (AP Curriculum 2013): 1.A, 1.D, 2.A, 2.B, 3.B, 3.D, 4.A, 4.B, 4.C

1.A: Change in the genetic makeup of a population over time is evolution. 

1.D: The origin of living systems is explained by natural processes. 

2.A: Growth, reproduction and maintenance of the organization of living systems require free energy and matter. 

2.B: Growth, reproduction and dynamic homeostasis require that cells create and maintain internal environments that are different from their external environments. 

2.E: Many biological processes involved in growth, reproduction and dynamic homeostasis include temporal regulation and coordination. 

3.A: Heritable information provides for continuity of life. 

3.B: Expression of genetic information involves cellular and molecular mechanisms.  

3.D: Cells communicate by generating, transmitting and receiving chemical signals. 

4.A: Interactions within biological systems lead to complex properties. 

4.B: Competition and cooperation are important aspects of biological systems. 

4.C: Naturally occurring diversity among and between components within biological systems affects interactions with the environment.