Answer:
b. Cities tend to require very <em><u>large </u></em>inputs of energy and materials resulting in <em><u>large</u></em><em> </em>outputs of waste.
Explanation:
Modern cities require much more energy because of the increase in population resulting in the demand for inputs of energy and materials to be particularly high. But because this relationship to waste output is inversely proportional, there will also be large outputs of waste. Cities need to place a waste management system in their towns in order to combat this unsustainable way of living,
Answer:
True. However, those are not two types of discussion groups, but only one.
Explanation:
Online forums possess a tree-like structure. A forum can contain several sub-forums discussing topics somehow related to the original subject.
Forum conversations differ from chat, because messages are typically longer, and are stored for longer. Each conversation in an online forum is called a "thread".
A bulletin board is a<em> type </em>of online forum in which its participants post questions to a related topic and other members try to provide the answer to that question. The answer is open to discussion and other members are free to intervene and correct the answer, if needed. A moderator is usually present, to ensure ethical behaviour and encourage the participants.
I can't entirely see the picture.
