The polymerase chain reaction (PCR) uses thermostable polymerases to amplify a specific target region of DNA. Why must the DNA polymerases used in PCR be stable at temperatures considerably higher than room temperature

c. establishing proper sleep hygiene

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.