One difference between mechanical and electromagnetic waves is that mechanical waves need a medium to pass through (solid, liquid, gas). EM waves can travel through matter or though a vacuum. In regards to telecommunications, EM waves can be radio waves, these are used in TV's, phones, computers, radios. Mechanical waves somewhat relate to this since radios produce sound;so an EM wave would turn into a mechanical vibration inside a speaker then sound would be produced.
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1/4 : 25%
3/4 : 75%
4/4 : 100%
2/4 : 50%
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The answer is A.
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Adaptive immunity recognizes antigens of viruses.
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Some challenges animals might face when migrating are disease, global climate change, overexploitation, and habitat destruction.
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In virtually every corner of the globe, migratory animals face a growing array of threats, including habitat destruction, overexploitation, disease, and global climate change. Saving the great migrations will be one of the most difficult conservation challenges of the 21st century.