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Echinoderms and Chordates 494
Summary with Key Terms
CHEMISTRY AND CELL BIOLOGY
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active allele allow amino acids animals atoms bacteria become begin biologists Biology birds blood body bonds building called carbon dioxide carry cause cells chapter chemical chromosomes complex consists contain cycle cytoplasm depends disease divide early ecosystems eggs electron transport chain electrons energy environment enzymes eukaryotes evolution evolved example female Figure fish flow flowers forest fossil four fungi gametophyte genes genetic glucose Greek grow growth human idea important increase individual insects kinds leaves light living look male material means membrane million molecules move natural occur organisms oxygen pair percent plants population prevent produce proteins Questions reaction replication reproduce researchers result roots seeds selection separate sequence shape showed single soil species structure sugar surface tion tissue trees University usually wall