The area of land drained by a single river or stream is called a (n) :

A student wants to design an experiment to test the hypothesis "temperature affects the reproductive rate of bacteria." What should the independent variable be?

Why does putting your name on a health behavior contract indicate your commitment to the contract?

Explain the relationship between ore and tailings

Can changing the diet reduce high blood pressure? Vegetarian diets and low-salt diets are both promising.

Select the correct answer. Christopher came down with chicken pox after spending time in his child's day care. The this scenario? A. susceptible host B. infectious agent c. mode of transmission portal of entry E. reservoir

Which would not form an organic fuel

Amy suggests that although other species need to be concerned about air pollution, human beings are different because they can develop the technology to live with it. amy supports:

Explain why red-green color blindness occurs more frequently in males than females?

A system for naming species using a 2 word naming system is called

What did darwin call the "preservation of favorable variations and the elimination of injurious variations"?