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Notes: To determine if a vaccine for a disease in a certain bird species is effective, vaccinate 50 birds, do not vaccinate 50 other birds, and expose all 100 to the disease.
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Notes: To determine if a vaccine for a disease in a certain bird species is effective, vaccinate 50 birds, do not vaccinate 50 other birds, and expose all 100 to the disease.
Notes: The idea that jackrabbit population decreases because of coyote population is and example of a scientific hypothesis.
Notes: A student investigated the conditions needed by seeds to germinate and the table shows that the seeds do not need light to germinate.
Notes: Bones and muscles provide structural support for a human.
Notes: Nervous, muscular, and skeletal systems coordinate to cause an arm to move.
Notes: The purpose of the aortic valve that separates the left ventricle from the aorta is to prevent blood from flowing back into the left ventricle