Question

read the text.
beavers in the wild build dams of sticks and dirt across streams and brooks, blocking the flow of water and forming ponds and wetlands. this behavior can cause conflicts with people when beaver dams flood roadways and property. if the dam is destroyed, the beavers will rebuild, because when they hear running water, their instinct is to dam it. engineers cleverly resolved this issue by designing a special pipe that is inserted through the middle of a beaver dam. the pipes end is located away from the dam and fenced off, so beavers cant block it. water flows through the pipe, both preserving the beavers pond habitat and protecting peoples property.
which organizational structure does this text primarily use?
problem - solution
compare - contrast
sequential

Explanation:

The text first presents the problem of conflicts between beavers' dam - building behavior and people's property (beaver dams flooding roadways and property, and beavers rebuilding dams when destroyed). Then it introduces the solution engineers came up with (designing a special pipe to solve the problem while preserving the beaver's habitat). It does not compare and contrast different things, nor does it present events in a sequential order (like a step - by - step process over time). So the organizational structure is problem - solution.

Answer:

problem - solution