<u>Answer:</u>
Information on them is often not backed up with reliable sources.
<u>Explanation:
</u>
- Crowd-sourced websites are open for everyone to feed information to. Most of the people who feed this information do not fetch it from sources that are authentic and reliable.
- They either try to put up their personal experiences or the information they heard somewhere, someday.
- Very few who genuinely understand the importance of the correctness of information take efforts to look up for the information through reliable sources to answer the queries and questions.
Answer:
Diseases emerges.
Explanation:
In Africa many people are affected by the diseases due to the lack of clean water.
<span>Sparta, led by Agis II, defeats Argos and her allies at the battle of Mantinaea. Melos, after supporting Sparta in the Peloponnesian War, is attacked by Athens. ... The Athenian fleet is defeated by Lysander of Sparta at Notium.</span>
Answer: advances in technology energy resource discoveries energy prices social pressures and other factors.