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Irene is N years old. If Tom is twice as old, which of the following algebraic statements shows his age now?

What is the measure of arc S T? 56° 68° 112° 163°

This food web combines several food chains that exist in a single ecosystem.

Which organism in this food web is a producer?

◯ A. Cayote

◯ B. Mouse

◯ C. Acorns

◯ D. Cougar

A student draw the following flowchart to show the movement of nutrients.

Factory  Air Plants Animals

Which nutrient is the student most likely to be diagramming?

◯ A. Oxygen

◯ B. Sugar

◯ C. Carbon

◯ D. Nitrogen

Which model best summarizes the importance of solar energy for life on Earth?

◯ A. A food chain

◯ B. The carbon cycle 

◯ C. The rock cycle

◯ D. A consumer index