Answer:
stethoscope is the instrument used to measure heart beat
Glass is brittle
Iron is malleable and ductile
glass is ressistant to corrotion
iron corrodes easily
Liquid doesnt dissolve the glass
some luquids can dissolve iron
iron is magnetic
glass isnt
Organisms that use the same resources because there may not be enough for all, so it then becomes a competition of who gets it and who doesn't.
The answer is c pantorhenic acid
