I think the correct answer is
(A) changing in abiotic factors
The answer is B, to maintain law and order in a country
Organisms (belonging to the same species) may adapt in different ways to better exploit different environments or resources-- survival of the fittest. They also may evolve varied characteristics for attracting mates for reproduction. This means that different groups evolve differently. Over time, these groups or populations may become so different that they can no longer breed together -- and separate species are formed.
Answer:
B
Explanation:
A is not right it didn't end any colonialism, C is wrong because there are leaders in a government system, D is also wrong because its not the Emancipation Proclamation that freed all slaves in the south and in the north.
Answer:
A. To increase the risk of having to defend an attack.