Question

practice it!
a scientist has observed that grass grows more in the summer than in other months.
which of the following would be a good testable question to start some type of investigation based on the observation made?
why does grass grow in the summer more than in the fall?
does fertilizer affect the growth of grass?
how does grass grow?
in what month does grass grow the most: june or july?

Explanation:

The observation is about grass growing more in summer than other months. A good testable question should be related to this seasonal - growth comparison. "Why does grass grow in the summer more than in the fall?" directly relates to the given observation and can be investigated by looking at factors like sunlight, temperature, etc. The other questions are either too general (How does grass grow?) or not related to the summer - growth observation (Does fertilizer affect the growth of grass?, In what month does grass grow the most: June or July?).

Answer:

Why does grass grow in the summer more than in the fall?