The frequency of a wave represents the number of wavelengths that pass a specific point per second. The unit for frequency is hertz (Hz). A wave's period is the time for one wavelength to pass a specific point. The wavelength of a wave is the distance between two successive crests or troughs.
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Independent Variable: Fertilizer
Dependent Variable: Plant Growth
Hypothesis: Giving plants fertilizer will help them grow faster than plants with no fertilizer.
Controls: Type of plant, watering routine, temperatures, amount of sunlight.
Explanation:
Independent variable always modifies the dependent variable.
Dependent variable always changes based off of the independent variable.
The hypothesis must be a statement that can be tested with an experiment.
Control variables should stay the same throughout the experiment in order for the experiment to be testable and accurate.
Answer:
Damaged tissue releases chemicals that activate platelets and stimulate the formation of blood clots. Which of the following predictions about the activity of platelets best describes a positive feedback mechanism?
Activated platelets release chemicals that inhibit blood clot formation
Explanation:
Blood platelets inhibits blood clot formation with the aide of vitamin K that enhances the clotting factor
