Butterflies, bugs, and worms (Young discoverers)
Publisher: Scholastic
Published: 1999
Language: eng
Format: Unknown Binding
Number of pages: 32
ISBN-13: 9780439099608
Subjects: Experiments; Invertebrates
First sentence: Because there are so many kinds of animals, zoologists begin by dividing them into two groups: animals with a backbone (vertebrates) and animals without a backbone (invertebrates).