Answer:
D. plant growth increases in the spring
Explanation:
You have to observe the plant growth throughout the year to collect your information/findings. A. Earthquakes are bad, is something thats just common sense, even little primary school kids can tell you, "earthquakes are bad." B. Dogs like bones, is not observation, you will see your little friend dig up a whole and find a bone, and bury it again, many of us had, like the earthquakes, many know and there is no need for observation. C. Sunsets are pretty, this is also not observation because there are some people in this world that don't like sunsets, so 'sunsets are pretty' is an opinion.
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