*Question*
If trunk circumference and height in young trees corresponds with the number of rings in the trunk, then what is one thing that rings can tell you? Answer choices: - chemical changes - encoded information - coded genes - age of a woman - age of a tree - age of a lake - it can be seen - size of a tree
**Answer**
age of a tree

*Question*
If fuel cells can power computers, then what can power computers? Answer choices: - cities - Fuel cells - energy - kinetic energy - industry - heating liquids - information - Solar energy
**Answer**
Fuel cells

*Question*
If active immunity results when an immune response to a germ produces memory cells, then active immunity is when an immune response occurs after a germ produces what? Answer choices: - harmful substances - bioaerosols - rapid expansion - Allergies - anemia - it needs them - Chemical energy - memory cells
**Answer**
memory cells

*Question*
If plant reproduction requires insects and hummingbirds, then insects and hummingbirds are required for what to reproduce? Answer choices: - fish - bees - herds - growth - courtship - plants - mating - nutrients
**Answer**
plants