"When Pavlov was measuring salivation in a dog he provided meat powder and a metronome to the dog. Later the metronome was presented alone and the dog still salivates in anticipa­tion of the meat powder. The metronome would be called the ."

conditioned stimulus

Explanation:

Conditioned stimulus -

It refers to as the neutral stimulus , which triggers or initiates the conditioned response , is referred to as the conditioned stimulus .

Ivan Pavlov was the very first one to give meaning to the term conditioned stimulus , by experimenting on the dogs .

Hence , from the given scenario of the question ,

The correct answer is conditioned stimulus .

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.

b is the answer and if you need further with anything message me