<span>The three properties of components of the universe are frequency,wavelength and Intensity can be determined using electromagnetic radiation.Frequency is defined as the number of cycles per second, and it's unit is Hertz (Hz).Formula is E=hν. Wavelength is the distance of one full cycle of the oscillation.The wavelength related to frequency formula is c=λν.Amplitude is the distance from the maximum vertical displacement of the wave to the middle of the wave. Then amplitude tells about the brightness of the wave.</span>
The thoracic cage is formed by the 12 pairs of ribs with their costal cartilages and the sternum.
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There are many reasons to why slaves were essential in the colonial economy:
Slaves were generally used more in the south, because large plantations were found there, which meant that the need for large amounts of workers.
Slaves provided cheap labors, and as they were not "citizens" of the US, they were not allowed their rights.
Slaves were also relatively easy to buy and replace, however, their survival rates were not that good after they traveled long distance.
etc.
hope this helps
