Question

which of the following is not an investigation? *
researching how many species of fish live in a coral reef.
observing how ants move in and out of their nest.
testing if plants grow faster with fertilizer.
interviewing people about how much water they drink daily.

Explanation:

Investigation in natural science involves observing, testing, and researching natural phenomena. Interviewing people about water intake is a social science (survey) method, not a natural - science investigation.

Answer:

Interviewing people about how much water they drink daily.