Katrina wrote the following introduction for her essay about environmental ecosystems.

An ecosystem is a complex community of living and nonliving things that work together. There are several different types of environmental ecosystems on our planet, including forest, grassland, desert, tundra, freshwater, and marine. Each ecosystem has unique characteristics and relationships. Unfortunately though, many of our most fragile ecosystems are in danger because of pollution and other factors that are making it hard for these communities to thrive.

What is the most logical way to organize the following ideas, based on the introduction?

Causes of Ecosystem Deterioration
Characteristics of Different Ecosystems
Ways to Stop Ecosystem Pollution
Effects of Ecosystem Pollution
A.
1, 4, 3, 2
B.
1, 4, 2, 3
C.
2, 4, 3, 1
D.
2, 1, 4, 3




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