This science book introduces children to the animal life cycle and how eggs develop. It features new vocabulary, a photo glossary, an index, and reading activity to develop comprehension skills. Why are eggs so important to the animal life cycle? Learn about how eggs develop and the types of animals that lay them in the children's book What Is Hatching? This kid's book teaches your child about the science and biology behind different animals that they know and love. The science book features new vocabulary, a photo glossary, an index, and a reading activity to enhance reading comprehension skills. Rourke proudly publishes respectful and relevant non-fiction and fiction titles that represent our diverse readers, and are designed to support reading on a level that has no limits!