Question

which of the following method is best used to count populations of organisms that are highly mobile?
sampling plants
observing from a distance
counting nests
tag and recapture

Explanation:

For highly mobile organisms, direct counting or sampling (like sampling plants) is hard. Observing from a distance or counting nests don't accurately account for their movement. The tag - recapture method (capture, tag, release, then recapture to estimate population) is designed for mobile populations as it accounts for their movement and distribution.

Answer:

D. tag and recapture