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12-Ahermatypic corals : a- build colonial reefs in tropical seas.
b-tend to be solitary in habit.
1 3-Ahermatypes : a- are restricted to warm shallow water.
b-can be found in deep cold waters.
14-the clarity of water : a- is one of the factors that limits the coral reef
develpment.
b-does not affect the growth of coral reefs.
15-carbonate secretion by coralis : a- is limited to the cold water of the
bottom of the ocean.
b-limited to the warm, sunlit waters of upper 30 m of the water column.
16-corals : a- are badly affected by high salinity.
b-thrive in brackish water.
17-corals thrive : a- in muddy water.
b-in clear water.
18-Hermatypic corals : a- flourish in tropical seas that contain high
concentration of nutrients.
b-flourish in clear tropical water that contain low levels of dissolved
nutrients.
19-Encrusting corals : a- are found in the algal ridge.
b-are found in the buttress zone.
20-The buttress zone is found : a- below the algal ridge.
b-next to the algal ridge.
21-The reef face : a- extends downward from the buttress zone.
b-is a broad reef flat just landward of the algal ridge.
22-the reef terrace : a- is found in deep quieter waters.
b-is found landward of the algal ridge.