The nonnative evergreen blackberry has invaded the thick grasses of some abandoned agricultural fields in Olympic National Park. A related native species, salmonberry, has not invaded the fields, even though it is common in the surrounding rain forest. Elk are abundant in the area, love to eat salmonberry plants, but do not eat evergreen blackberry because of its big thorns.

Make one hypothesis on why the fields are invaded by evergreen blackberry and not by salmonberry. Briefly describe one experiment that will test your hypothesis. In your experiment, identify the control group and the experimental group.

Hypothesis:

Experimental design:

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