Acircuit is a. a switch that interrupts an electric current. b. the incomplete path of an electrical current. c. the complete path of an electrical current. d. an open path of an electrical current.

In order for a circuit to function, it must have a complete and connected path on which an electrical current (electrons) can travel. Electrons cannot travel over a break in the path.
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1. true.2. true.3. true.4. false.5. true.the concept of darwin's theory of evolution involves the idea that there are limited resources in a given living environment and that the organisms which live within have variations in their genetic make up due to random mating. the ones with beneficial genetic variations can express certain traits which give them an upper hand in surviving and reproducing in the said environment compared to ones who may have a more disadvantageous variation in traits. over time, the organisms with an upper hand will survive and reproduce more frequently and pass on their beneficial genes while the others die. the result is evolution, where we observe (usually, but not always) eventually, phenotypic distinct changes.