Question

when invasive species are introduced into new areas, the consequences often include widespread disruption of the native ecosystem. this has happened repeatedly in australia, where native species evolved in an isolated environment. in the 1920s, several thousand camels were released into the australian outback. originally imported to do work, the camels werent needed once gasoline engines arrived. because they have no natural predators in australia, the number of now - wild camels has increased to over a million. the australian camel herd is now the largest on earth. these camels drink large amounts of water, exhausting water holes important to native populations. they also eat vast quantities of vegetation, leaving insufficient food for native birds and reptiles. the natural ecosystem cant cope with the camels.
which organizational structure does this text primarily use?
compare - contrast
cause - effect
problem - solution

Explanation:

The text first presents the introduction of camels (cause) and then details the impacts like ecosystem disruption (effect), which is characteristic of the cause - effect structure.

Answer:

cause - effect