All scientists follow one scientific method of investigation

False

Explanation:

Scientists rarely follow the steps of the scientific method as textbooks describe it. ... “There isn't one method of 'doing science.”

There are different kinds of scientific methods like the inductive and deductive

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i believe it's c. the trait for large beaks will be passed on to future generations through natural selection.

since eventually smaller beaks would have to find another source of food or even eventually just die out from the lack of food.