Question

practice it! all the following are examples of observations, except: the scientist sees that there are fewer birds in an area. the ph meter the scientist uses in the river shows that the water is slightly acidic. a thermometer tells the scientist that the temperature is 30 °c (86 °f) outside. the scientist wonders what is causing changes to the ecosystem.

Explanation:

Observations are factual notices. Seeing fewer birds, getting pH and temperature readings are observations. Wondering about ecosystem - changes is a question, not an observation.

Answer:

The scientist wonders what is causing changes to the ecosystem.