Answer:
B.
Explanation: Mechanical waves need a medium to travel.
C. A survey is asking people what they think is the answer.
The birthplace of stars are massive cosmic structures formed from gases, also known as nebulas.
The answer is C. Because energy cannot be created or destroyed
Answer:
The results of intergroup conflict are largely negative in that such a struggle lowers the morale and weakens the solidarity of the group. Conflict causes social disorder, chaos and confusion. War as a form of conflict may destroy the lives and properties of countless individuals.
