Jellyfish are among the most fascinating animals in Earth's oceans. Beneath the waves, these soft, ghostlike creatures drift through the water collecting prey with their dangling tentacles. Readers will discover how a jellyfish's body is structured, how jellyfish grow and reproduces, and how scientists classify jellyfish into different groups. They will also find out why swimmers have come to fear these strange, ancient animals. The complex text in this title allows readers to determine main ideas and explain how they are supported by key details. The grade-appropriate context helps readers determine the meaning of domain-specific words as well.