An analysis was conducted to determine the Worst Cities for Respiratory Infections to promote awareness to people concerning respiratory infections. And according to the surveys conducted, not only did the West region have the least cities on the list of the “The 50 Worst Cities for Respiratory Infections”, but the American West is ranked eight out of the top ten cities wherein physicians noted and recorded the fewest respiratory antibiotic prescriptions for each individual in that area.
Answer:
20% of number 1 to 70 has one or nine in it
Explanation:
20% numbers from 1 to 70 have 1 or 9 in the unit's digit. 1,9,11,19,21,29,31,39,41,49,51,59,61,69 this is that series of numbers .These are total 14 numbers out of 70 so 14/70×100 gives us 20 % occurrence of 1 or 9 at unit place.
I think your answer is b based off the information I inquired
second I believe is A lemme know if I helped
<u>Answer:
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The build-up of three oxygen created our ozone layer around two billion years ago.
<u>Explanation:
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- The ozone layer is a part of the stratosphere which is located right after the troposphere in the atmosphere of the Earth.
- The ozone gas is made up of the abundance of three oxygen molecules combining with the ultraviolet radiation emitted by the Sun.
- The development of the ozone layer happened around two billion years ago when the oxygen concentration levels on the planet began to rise slowly and gradually.
