You are a plant scientist investigating whether potassium is an important element in fertilizer for plant growth. You’ve written a testable question for investigation that includes an independent variable and dependent variable. Now develop a hypotheses, alternative hypothesis, and a null hypothesis for the investigation.

The resting potential of a neuron refers to a. the electrical polarization of the inside and outside of the neural membrane. b. a brief electrical charge that travels down the axon. c. a capacity to reabsorb neurotransmitter molecules released into the synaptic gap. d. the storage of neurotransmitter molecules within synaptic vesicles.

Why is the road most slick when it first begins to rain? a. oils the road has absorbed begin to float. b. the water has not had time to run off. c. a higher concentration of dirt makes the road more slick. d. none of the above

When must a driver yield to a pedestrian? a. only when the pedestrian is in the roadway b. only when the pedestrian is in a designated crosswalk c. only when the pedestrian has a walk signal d. always