Q: Students on two different school campuses are comparing the growth rate of grass three weeks after fertilizer has been applied. The same fertilizer and the same amount of water are used on both campuses. Which additional variable is most important to control when the results of the two investigations are compared?
A: type of grass used
Q: Grooves running down the sides of a riverbank are most likely caused by
A: rainwater.
Q: Why are many telescopes used far from cities?
A: The light from the cities makes it hard to see stars.
Q: Which of the following would most likely happen if grasses and shrubs were removed from a rural Massachusetts ecosystem?
A:
There would be a decrease in food energy produced by the ecosystem.