One half-life after a radioactive isotope is incorporated into a rock there will be only half of the original radioactive parent atoms remaining and an equal number of daughter atoms will have been produced.
Ethyl alcohol is one of the series of organic chemical compounds
in which a Hydrogen (H) attached to carbon is replaced by a hydroxyl (OH). It
is made from sugar, starch and other carbohydrates by fermentation with yeast
and synthetically from ethylene or acetylene. It has been used in beverages
which has unstable, combustible, colorless liquid with slight distinctive odor.
The amount of Ethyl alcohol in any drinks can be determined by multiplying the
percentage (%) of alcohol and size.
Answer:
why an athlete would need to be concerned about twitches or contractions is because, whenever they perform, and such thing happens, it will most likely distract the athlete, and cause the athlete doing his/her performance to not be as good, and may lead to failure, for example, when someone is running very fast for a sprinting race, and he has a contraction in his leg it will cause him to react by showing signs of pain by slowing down or even tripping and falling, causing him to lose the race.
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I would say B because when the whale slaps his tail, it moves.
