Which scientists proposed the model explaining muscle

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  Callous

He was indifferent to the outcome of the game.

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Voracious

What is the synonym for the word "maverick"?

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Ambiguous

A minister in charge of a Christian church or congregation, especially in some non-episcopal churches

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Frail

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Fright 

The river was shallow near the shore.

Climb or move with difficulty or a lot of effort, typically using one's hands and feet