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Krishne wants to measure the mass and volume of a key. Which tools should she use?

A. a balance and a beaker of water

B. a balance and a meter stick

C. a beaker of water and a ruler

D. a ruler and a meter stick

Distinguish between a transverse wave and a longitudinal wave.

When a vertical beam of light passes through a transparent medium, the rate at which its intensity i decreases is proportional to i(t), where t represents the thickness of the medium (in feet). in clear seawater, the intensity 3 feet below the surface is 25% of the initial intensity i0 of the incident beam. what is the intensity of the beam "10" feet below the surface? (give your answer in terms of i0. round any constants or coefficients to five decimal places.)

Select the correct answer. what does the process of natural selection involve?