A scientist wants to make a DNA fingerprint, and she has used polymerase chain reaction (PCR) and restriction enzymes. What should her next step be?
• A. Use imaging techniques.
• B. Run gel electrophoresis.
• C. Make a karyotype.
• D. Obtain a sample.

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

Body temperature is tightly regulated in mammals for example when external temperatures drop too much the body of a mammal response by in order to it's core temperature.

Is a glacier nothing more than a huge mineral flowing downhill? be sure to defend your answer with facts.