Scientists realized each person's DNA is different in 1984.

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True!

By the 1940s scientists realised that DNA contained the code for life, and in 1953 Watson and Crick at Cambridge University discovered how information was stored in DNA and transferred to the next generation. In 1984 Professor Alec Jeffreys discovered the variations in DNA, unique to each individual.

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

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