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Arthropods

Jenny Karpelenia (author)

Publisher: Perfection Learning ISBN: 9781622991860

Crustaceans, arachnids, and insects are part of the arthropod family. Reading Essentials in Science.

Bacteria and Viruses

Michael Crumpton (author)

Publisher: Perfection Learning ISBN: 9781622991907

Bacteria are single-celled organisms with the ability to help and harm other living things. Viruses can only reproduce in host cells, often causing infections. Reading Essentials in Science.