Read the following question. "How fast do hummingbirds fly?" Why is the question a scientific question? It expresses an opinion. It can be tested during field studies. It can be answered without an investigation. It asks about phenomena that cannot be measured.

The question "How fast do hummingbirds fly?" is a scientific question because it can be tested during field studies. This question can be answered through direct observation and measurement of hummingbirds' flight speeds, making it a testable and empirical question.