Biosystems-Cahaba River
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SCI.7.6.1: Define ecosystem, population, and organism.
Objective
SCI.7.6.4: Describe an ecosystem and its components. 16. Construct an explanation based on evidence (e.g., cladogram, phylogenetic tree) for the anatomical similarities and differences among modern organisms and between modern and fossil organisms, including living fossils (e.g., alligator, horseshoe crab, nautilus, coelacanth).