B is the first one D is the last on that should be it
Answer:
Acid rain etc.
Explanation:
Climate change, ocean acidification, carbon emissions, urbanisation, wastewater treatment, ozone depletion, water contamination, species extinction, and other environmental issues affect every individual, plant, and nation on earth.
These worldwide ecological threats are unlike those that mankind has previously encountered.
Researchers often use computers in their experiments to keep from influencing the participants and to keep themselves <u>blind</u> regarding the conditions to which the participants have been assigned.
<h3><u>Why is research blinding crucial?</u></h3>
Blinding is crucial to prevent bias (such as observer bias and demand characteristics) and guarantee the internal validity of a study.
Participants may alter their behavior in ways that affect the outcome that researchers are aiming to measure if they are aware of whether they are in a control or treatment group. If those providing the treatment are aware of the participants' assigned groups, they may treat them differently, which could either directly or indirectly affect the outcome.
Learn more about research blinding with the help of the given link:
brainly.com/question/3453118?referrer=searchResults
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The Teapot Dome Scandal was an American political scandal of the early 1920s. It involved the secret leasing of federal oil reserves at Elk Hills, California, and Teapot Dome, Wyoming, by Albert Bacon Fall—U.S. Pres. Warren G. Harding's secretary of the interior—to oil tycoons Edward L.
It can't be Edmund Spenser or William Shakespeare: they are English poets, not explorers.
Both Francis Drake and Sir Walter Raleigh were explorers: they are the options we can consider.
The correct answer is Francis Drake: he brought tobacco plant to Europe.
The question also mentions Walter Raleigh: he is known for popularizing Tobaco in the Old World.
