Which of the following is an example of an indirect observation? a. counting rings on a tree stump to determine its age b. using tools such as a thermometer or rain gauge to take measurements c. counting the number of bald eagles that land near a river d. using a live video to observe nesting owls

The correct answer will be option-D.

Explanation:

Indirect observation is an observational technique where the experimenter person does not record the data directly but use the past data recorded by another person in videos, books, documents and other sources.

In the given question, to observe the behavior of nesting owls, the experimenter is using the means of live video instead of directly observing to record the data.  

Thus, option-D is the correct answer.

the correct answer is:

a population changes in response to a change in the environment.

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