Which characteristic of four different dinosaur fossils makes a dinosaur most similar to the present-day birds? flexible wrist flapping ability flight feathers primitive feathers

primitive feathers is the answer

poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.

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