Which of the following is an example of variation? A)A wolf species that has different lengths of fur
B)A frog that has changed over time to hop faster
C)A lake that has become more clear with new environmental protection

In france, grapes are 1.95 euros per kilogram. what is the cost of grapes, in dollars per pound, if the exchange rate is 1.14 dollars/euro? (2.6)

Which three statements represent the benefits of performing experiments using computer simulations?

Two solids are mixed in a flask and stirred. after a few minutes, the flask becomes cold. which of the following best describes this reaction? a. an exothermic reaction b. a combustion reaction c. an endothermic reaction d. a decomposition reaction