Packed with science, this book dives into the underwater world of plankton. Just because we can't see them doesn't mean these microscopic ocean superheroes aren't essential for life on Earth. Meet some weird and wonderful species of zooplankton and phytoplankton See how many marine animals begin their life cycles as tiny zooplankton Learn how plankton are essential to all marine ecosystems and food webs And discover how plankton make oxygen and take harmful carbon dioxide gas from the air Using fantastic photos, 3D artwork, and scanning electron microscope (SEM) imagery, this book lets kids explore the complicated, fascinating, and incredible worlds of these tiny superhero life forms.