The reasons why DDT is classified as a persistent organic pollutant are;
- DDT can be used to control diseases, such as malaria and typhus, that are spread by insects.
- DDT is detected in food worldwide and the general human population is most commonly exposed to the toxin through food.
Persistent Organic Pollutants can be regarded as toxic substances which are made up of organic chemical compounds.
These are industrial chemicals such as;
DDT is classified as a persistent organic pollutant because of it's usefulness in control diseases and it is been found in food stuff across the globe.
Learn more about DDT at;
brainly.com/question/14154063
Since Goodman is unresponsive, Valerie shall check for breathing and a pulse simultaneously for no more than <u>10 seconds</u>.
<h3>What is cardiac cycle?</h3>
Cardiac cycle is a process that involves the complete heartbeat of the human heart, which comprises sequential alternating contraction and relaxation of the atria and ventricles, so as to cause blood to only flow in one direction throughout the human body and aid respiration (breathing).
As a general rule, Valerie shall check for breathing and a pulse simultaneously for for at least 5 seconds, but shouldn't be more than <u>10 seconds</u>.
Read more on pulse here: brainly.com/question/14528211
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GOLD IN THE SKY - By Alan E. Nourse
We can see in the story that the setting is in a cockpit, in a lab, simulating a landing to Mars because of this paragraph; "Greg twisted around in the cockpit that had been built just big enough to hold him, and shifted his long legs against the brace-webbing, trying to get them comfortable." We can see that Greg Hunter is nervous, "His heart hammered in his throat, and his eyes ached fiercely, but he paid no attention. His finger crept to the air-speed indicator, then to the cut-off switch." The time period we can state is around the 1950s. It implied the first trip to Mars, "He heard the count-down monitor clicking in his ears, and his hands clenched into fists. How far from Mars would he be 10 minutes from now?" In conclusion, the time is believed to be sometime in the 1950s, and the setting is in a lab where Gregory Hunter is going on a trip to mars when something wrong has happened.