Question

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

Explanation:

• An observation is a factual, measurable, or perceivable statement.
• The first three options (thermometer reading, pH meter result, seeing fewer birds) are observations as they are based on measurement or direct perception.
• The last option ("The scientist wonders what is causing changes to the ecosystem") is a question or a hypothesis - forming thought, not an observation.

Answer:

The scientist wonders what is causing changes to the ecosystem.