Animals can be divided into two main groups: invertebrates and vertebrates. The invertebrates—such as insects, sea stars (starfish), and worms—lack a backbone. The body tissues of many invertebrates are supported by some type of outer structure, called an exoskeleton. Vertebrates have a backbone. Animals categorized as vertebrates include fish; amphibians, such as frogs and salamanders; reptiles, such as snakes and lizards; birds; and mammals such as dogs, cows, horses, monkeys, and humans.
Britannica School: Students can toggle between 3 reading levels on each article, have articles read aloud, and use Merriam-Websters’s double click dictionary to hear words pronounced and read their definitions in English or Spanish. Each article can also be translated into over 80 languages.
Scholastic Science Flix: Emphasizing the latest STEM thinking and the Next Generation Science Standards, ScienceFlix® is transforming the way students access science topics, acquire scientific knowledge, and build an abiding interest in science, technology, and engineering.
WORLD BOOK ENCICLOPEDIA ESTUDIANTIL HALLAZGOS: This dedicated Spanish-language database contains videos, compare-and-contrast features, selected articles, and a visual dictionary to allow ESL students and Spanish-learners the chance to learn. Integrated with World Book Kids for parallel English-language content.
World Book Student: Tailored for students in elementary and middle schools, Student includes all the articles from the print versions of the World Book Encyclopedia, plus thousands of additional articles, learning resources, and research tools.