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Type: BOOK - Published: 2013-01-01 - Publisher: Twenty-First Century Books
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How do living things reproduce? How do twins, triplets, and other multiple births happen? How does fertilization occur? Find out in this frank and accessible lo
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Praise for the previous edition: SSLI "Honor Book," Science, Grades 7–12 category—Society of School Librarians International The immune system is crucial to