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Which item can only be observed using some kind of instrument? 1.heat from the Sun 2.the planet Venus 3.a radio signal 4.an earthquake
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13 votes
13 votes
Which item can only be observed using some kind of instrument?

1.heat from the Sun
2.the planet Venus
3.a radio signal
4.an earthquake

User MartinByers
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1 Answer

13 votes
13 votes
I believe it’s 2. The planet Venus
User Rawling
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