An experimental design included references to prior experiments, materials and equipment, and step-by-step procedures. What else should be included before the experiment can be started?

An easy way to calculate the amount of energy available at each level is to what?

What drives an advertising campaign?

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.