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Answer:
1)a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
2)Lateral inversion is the effect produced by a plane mirror in reversing images from left to right. This is the reason why ambulance is written laterally inverted so that its image is aligned properly.
3)a drop in the level of the uterus during the last weeks of pregnancy as the head of the fetus engages in the pelvis.
4)A cathode is the electrode from which a conventional current leaves a polarized electrical device. This definition can be recalled by using the mnemonic CCD for Cathode Current Departs. A conventional current describes the direction in which positive charges move
5)the rate at which something occurs over a particular period of time or in a given sample.
"an increase in the frequency of accidents due to increased overtime"
2.
the rate per second of a vibration constituting a wave, either in a material (as in sound waves), or in an electromagnetic field (as in radio waves and light).
"different thicknesses of glass will absorb different frequencies of sound"
Explanation:
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