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In what week of development does the heart begin beating?
Beak Sizes
Variations in the length, width, and shape of the beaks among bird species, often correlated with their feeding habits and ecological niches.
Exotic Species
Organisms introduced to new habitats where they are not native, often leading to ecological imbalance.
Indicator Species
Indicator species are organisms used to assess the health of an environment or ecosystem, as their presence or absence indicates specific environmental conditions.
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