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4. Over a period of 20 years, a researcher records the number of frogs of various
species they find on an island. They take care to always observe the same locations (for
the sake of a fair comparison.) They notice, over time, the number seems to be
decreasing. This leads them to hypothesize that the introduction of invasive species 20
years ago led to displacement of native species. This is best described as an example
of:
A. Deductive science
B. Experimental science
C. Hypothesis-driven science
D. Descriptive science