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In this book, early fluent readers will learn why zebra mussels are considered an invasive species, how they have established themselves in and impacted new ecosystems, and what scientists are doing to combat the problem. Bright, full-color photographs and carefully leveled text... Read Full Overview

In this book, early fluent readers will learn why zebra mussels are considered an invasive species, how they have established themselves in and impacted new ecosystems, and what scientists are doing to combat the problem. Bright, full-color photographs and carefully leveled text... Read Full Overview