Biology, 16.04.2021 16:20 brandiwingard
Which observational tool helped astronomers Arno Penzias and Robert Wilson discover the existence of the cosmic microwave background (CMB)?
A.
optical telescope
B.
radio telescope
C.
a digital camera
D.
space telescope
Answers: 3
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Which of the following is not a technology that can be used to conserve resources? a. hydropower b. volcanic power c. natural gas d. geothermal select the best answer from the choices provided a b c d
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