When is a circuit considered a "closed circuit"?
A. When the circuit is "on".
B. When the circuit is "off".
C. When the circuit is incomplete.
D. When a circuit's switch is open.

Abiologist counts the number of rabbits in a population each year and observes a decrease in population. since the coyote population has exploded, the biologist concludes that the coyote population has had a negative interaction with the rabbit population. which describes the biologist’s actions? a.) experimentationb.) inferencec.) observationd.) interacting