only about 3% because all of the other water would have to be filtered incorrect to be safe to drink so the student was incorrect in saying that there was water directly for humans to drink
Either number 1 or number 3.
Bahahaha I don't even know.
sorry
Your heart rate before exercising would probably be the at rest rate of say about 50-60 beats per minute whereas immediately after exercise it could easily be say 115-130 and depending on age there is an optimum heart rate for each age range which decreases somewhat with age. Timing for a full minute your heart rate is best as it will give the actual count whereas if you just do it for 10 seconds and then multply by 6 it would assume it will be consistent whereas it could decrease during the minute so the actual measured count for a full minute is more accurate.
Both have phosphate-pentose back bone, as well as both have adenine, cytosine and guanine bases.