The three methods for determining population size are observation, mark and recapture, and sampling. is it true or false.

I think the correct answer is true. The three methods for determining population size are observation, mark and recapture, and sampling. Observation is done by merely observing the size of the population. Another method is a technique called "mark and recapture." This technique gets its name because some animals are first captured, marked, and released into the environment. Lastly, the sampling is done by counting the animals in a small area and then estimating.

Exposed great deposits of coal and iron ore