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

An exothermic reaction is conducted in an insulated calorimeter filled with water. the calorimeter is then sealed so that there is no heat exchanged between the contents of the container and the surrounding air. which of the following statements is true about the reaction?

What is impossible to do with a hypothesis

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?