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| Read each sentence and identify the word/phrase that you believe correctly completes the statement. Then, click on the arrow to see if your answer is correct. 1. Estuaries are coastal regions defined by two main features: They are , and seawater mixes with . 2. Though many estuaries were formed by the flooding of river valleys, others developed as formed along the coast or by the , or subsidence, of land. 3. Typical estuaries show wide fluctuations in the of their water and the deposition of sediments along their bottoms. 4. The depletion of in muddy substrates results from a high concentration of and limited of water. 5. Organisms that withstand changes in salinity by keeping the salt concentration of their body fluids constant are known as . Another strategy is that of , which allow the salt concentration of their body fluids to change with the salinity of the water. 6. Most animals living on mudflats are and suspension feeders. Both feed primarily on . 7. The zonation of salt-marsh plants is basically controlled by their tolerance to . 8. are the temperate equivalents of mangrove forests. 9. Primary production in the communities that surround estuaries is very high because of the high density of in them. 10. Most of the food manufactured by salt-marsh plants and mangroves finds its way to consumers in the form of . This means that relatively few animals are . |