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 seawater with a temperature of 20°C to 21°C
Select the correct answer using the code given below:
1
1, 2 and 4 only
2
2 and 4 only
3
1 and 3 only
4
1, 2, 3 and 4