Question

which method to determine population size is the least invasive?
a. mark/recapture
b. direct observation
c. sampling
d. indirect observation
please select the best answer from the choices provided
○ a
○ b
○ c
○ d

Explanation:

Indirect observation involves observing signs of organisms (like tracks, nests) without directly interacting with or disturbing them. Mark/recapture requires handling animals, direct observation can be intrusive, and sampling may involve collecting specimens. Indirect observation is thus the least invasive.

Answer:

D. indirect observation