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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

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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2 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 Ferdinando Randisi
by
8.6k points

1 Answer

6 votes
I believe it’s 2. The planet Venus
User Sergio Nikolaev
by
8.9k points
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