Explain the difference between a parliamentary system of government and a presidential system of government

A key difference between presidential and parliamentary systems lies in the power to remove a chief executive or to dissolve the legislature. In parliamentary systems, the chief executive's term of office is directly linked to that of the legislature, while in presidential systems the terms are not linked.

Explanation:

clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.