The answer to this question is D: Psychoactive. It is the world's most widely consumed psychoactive drug.
Hey there!
Your answer: Available Space
The question is asking, which of the following options would be a (limited source). We have to find a option that has a limited source, which means that there is a limit to something. Your answer is (b) because there are limited space with the spce that is already available. Air temperature would NOT be your answer.
Hi there!
With humanity's constant burning of fossil fuels, large amounts of carbon dioxide get pumped into the atmosphere.
Under normal circumstances (without humans), greenhouse gases are good, as they help keep heat energy in, much like a blanket.
Now, with such large amounts of carbon dioxide, too much heat is being kept inside of this blanket. Our ice caps are melting, threatening the survival of many species of animals. Along with their melting, sea levels are rising (and will keep rising).
With our increasing population, the last thing we can afford is to lose land as well.
Hope this helps.
:)