When you heat a test tube, what should you do? (select all that apply.)
a. put a stopper in the top of the tube to prevent fumes from escaping.
b. point the tube opening away from your face or the faces of others.
c. look inside the tube often to observe results.
d. pick the tube up with a test tube holder or protected hands.

i got something better   a catchphrase here it is

ahem  

ahem

what the squwock

explanation:

the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy

identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.v