<p>6-B : human population is hard to determine because it depends on many factors which keep changing and are not concrete( variables and unknowns)
Instances from passage 1: Its not an exact science, but it comes pretty closeat least compared to figuring out the carrying capacity of Earth for human beings,
which is an art so dark that anyone with any sense stays away from it. </p>
<p>Instances from passage 2: human populations is estimated to range from fewer than 15 billion to mre than a trillian - carrying capacity is a subjective term - The number of people that Earth can support depends on how we on Earth want to live, on
what we want to consume, and on what we regard as a crowd. </p>
<p>23-E : The children are not aware about the vastness of the universe as well as its many mysteries.</p>
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