Tornadoes form in many different ways, so scientists struggle to predict when certain thunderstorms will turn into a tornado.
Answer:
The Correct answer to this question would be A. Session Musicians
Explanation: "Some businesses or musical groups hire the services of session musicians, also known as freelance or backup musicians, to help them record music or present live performances. Under such business contracts, the session musician is responsible for providing the necessary support to the group’s leader.
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Proportion, movement, rhythm
