Which method to determine population size is the least invasive? a. mark/recapture b. direct observation c. sampling d. indirect observation

Answer;

D. indirect observation

Explanation;

-Indirect observation is the method of determining population size in which the population is not aware of the sampler's presence. While using Indirect Observation the members of a population may be small or hard to find. It may be easier to observe their tracks or other signs rather than the organisms themselves.

-This method is least invasive as animals are observed from a distance without interacting with them.

littering streams           is the answer

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.