1) light year is the unit of length
2) time it takes for earth to rotate...8.64*10^4 s


- alternate energy's mcq answer was 'd', ( all of the above)
- enzymes are made of protein
- barometer measures pressure
- astronomical unit is 149 million km
- harmful microorganisms are called pathogens
-sky is blue due to scattering(option d)
-in combustion engine chemical energy is converted to mechanical

Can't recall more.

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