A test is reliable when it A. measures achievement

B. gives similar scores every time it is used.

C. measures intelligence.

D. measures what it is supposed to measure

The carbon cycle is best defined as a process in which a. carbon changes from inorganic forms to organic forms and back b. carbon is changed into other elements such as oxygen or nitrogen c. carbon is continually created from the sun’s energy by plants d. carbon is consumed and regenerated from other elements such as oxygen and nitrogen