In this case i am supposed to use the formula of magnification as indicated in the here
Magnification=size of the image divided by the size of the object
so in this case we have been given magnification and the size of the object
magnification=×10, 000 and size of the object=50 micrometer
size of the image=10000×50
=50,0000 micrometers
Air temperature: When temperatures (and the humidity) soar, the heart pumps a little more blood, so your pulse rate may increase, but usually no more than five to 10 beats a minute.<span>Body position: Resting, sitting or standing, your pulse is usually the same. Sometimes as you stand for the first 15 to 20 seconds, your pulse may go up a little bit, but after a couple of minutes it should settle down. Emotions: If you’re stressed, anxious or “extraordinarily happy or sad” your emotions can raise your pulse. </span><span>Body size: Body size usually doesn’t change pulse. If you’re very obese, you might see a higher resting pulse than normal, but usually not more than 100. </span><span>Medication use: Meds that block your adrenaline (beta blockers) tend to slow your pulse, while too much thyroid medication or too high of a dosage will raise it.
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B) surface area and temperature
C. because if you
go deep in water its freezing cold and its has a high salt content
