A student wants to study how exposure to water for 24 hours affects bacterial growth. Which is an appropriate step of scientific inquiry that the student should complete?
A. Make several guesses about the effects of water on bacterial growth.
B. Observe normal bacterial growth for 24 hours.
C. Ask a teacher what he or she thinks about bacterial growth.
D. Collect data from other experiments on bacterial growth.

Several processes form metal ore. match each process to its description. volcanic activity weathering hydrothermal energy rocks break down as they interact with air and water. arrowright density differences and other factors cause metals to concentrate in igneous rocks. arrowright seawater heats up from contact with hot rock, and metals dissolve in it. the water rises and contacts cooler water, causing metal ores to settle on the ocean floor. arrowright

The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. assume that the membrane acts like a parallel plate capacitor in which the effective charge density on the inner and outer walls has a magnitude of 7.0 × 10-6 c/m2. (a) what is the magnitude of the electric field within the cell membrane? (b) find the magnitude of the electric force that would be exerted on a potassium ion (k+; charge = +e) placed inside the membrane.

What are the factors that affect the resistance of a wire?