which method to determine population size is the least invasive? a mark/recapture b direct observation c…

Brief Explanations:

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

Answer:

D. indirect observation