Biological systems interact, and these systems and their interactions possess complex properties.
Enduring understanding 4.A: Interactions within biological systems lead to complex properties.
4.A.1: The subcomponents of biological molecules and their sequence determine the properties of that molecule.
4.A.2: The structure and function of subcellular components, and their interactions, provide essential cellular processes.
4.A.3: Interactions between external stimuli and regulated gene expression result in specialization of cells, tissues and organs.
4.A.4: Organisms exhibit complex properties due to interactions between their constituent parts.
4.A.5: Communities are composed of populations of organisms that interact in complex ways.
4.A.6: Interactions among living systems and with their environment result in the movement of matter and energy.
Enduring understanding 4.B: Competition and cooperation are important aspects of biological systems.
4.B.1: Interactions between molecules affect their structure and function.
4.B.2: Cooperative interactions within organisms promote efficiency in the use of energy and matter.
4.B.3: Interactions between and within populations influence patterns of species distribution and abundance.
4.B.4: Distribution of local and global ecosystems changes over time.
Enduring understanding 4.C: Naturally occurring diversity among and between components within biological systems affects interactions with the environment.
4.C.1: Variation in molecular units provides cells with a wider range of functions.
4.C.2: Environmental factors influence the expression of the genotype in an organism.
4.C.3: The level of variation in a population affects population dynamics.
4.C.4: The diversity of species within an ecosystem may influence the stability of the ecosystem.