| | *Explain factors*, including matter and energy, in the *environment* that limit the growth of plant and animal *populations* in natural *ecosystems*.*a |

| | *a A1.8.A Analyze a problem situation and represent it mathematically. 7.2.E Represent proportional relationships using graphs, tables, and equations, and make connections among the representations. A1.3.B Represent a function with a symbolic expression, as a graph, in a table, and using words, and make connections among these representations. A1.2.B Recognize the multiple uses of variables, determine all possible values of variables that satisfy prescribed conditions, and evaluate algebraic expressions that involve variables. |