Answer:
A. indicate potential danger in environment
Explanation:
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.
Bl4 bsl requires the use of a supply line respirator or all work within a sealed totally enclosed glove box.
A set of biocontainment measures called a biosafety level (BSL), also known as a pathogen/protection level, is needed to isolate harmful biological agents in a lab setting. From the lowest biosafety level 1 (BSL-1) to the highest level 4, there are several levels of confinement (BSL-4). The Centers for Disease Control and Prevention (CDC) in the US have established these standards. The same biosafety levels are established by a directive in the European Union.
Learn more about Bsl here:
brainly.com/question/13551898
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