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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. The subtidal zone extends from the lower edge of the intertidal zone to the (or ). 2. Turbulence in the water above the continental shelf influences the concentration of nutrients in the water column by preventing (or ). Turbulence also influences the deposition of sediment. For example, particle size along the coast is where there is more turbulence. 3. Most of the inhabitants of unvegetated soft bottoms are that feed primarily on , although some are suspension feeders. 4. Seagrass communities are typical of (or , or ) substrates in shallow, (or ) waters. Most of the plant material in these communities is slowly decomposed into because relatively few animals graze on seagrasses. 5. (or ) bottoms in shallow water are typically dominated by seaweeds. These seaweeds compete with sessile invertebrates for . 6. Kelps, which belong to the algae, are fast-growing primary producers. Kelp communities develop on hard bottoms along coasts where there are currents rich in nutrients. 7. Technically speaking, kelp consist of kelps whose fronds do not float on the surface. In kelp , by contrast, the frond float on the surface, forming a . 8. Kelps are known to be disrupted by grazing, primarily by . They are also harmed by currents, heavy wave action, and pollution. |