Q: 93 (CAPF/2017)

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Which of the following are the necessary conditions for the growth of coral reefs ?
1. Photic conditions
2. Clean and sediment free water
3. Sea salinity of 6%
4. Tropical sea water with temperature of 20DC to 21°C
Select the correct answer using the code given below :
question_subject: 
Geography
question_year: 
2017
question_exam: 
CAPF
stats: 
0,136,320,136,32,96,192