Answer
The correct option is determining the size of the fire coral population in a quadrat sample area and using it to estimate the overall population size .
Explanation:
Quadrat can be described as a method to calculate the size of individuals of a population. A quadrat is an instrument which has a square shape which is used by statisticians to measure the distribution of population in a unit area. By counting the number of individuals in the quadrat, the number of individuals in the whole area can be calculated.
It is an effective method because counting each individual from a population becomes extremely tiresome and may not be possible for larger populations.