Physics
Radioactive elements can be traced out in living cell through a technique called

All listed here
Centrifugation
Chromatography
Auto radiography

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Physics
Purpose of an optical filter is to

Transmit or absorb light of different colours
Refract light of different colours
Reflect lights of different colours
Dispense light into component colours

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Physics
Which is evidence that supports the dynamo theory?

Earth's outer core contains liquid that conducts electricity
Convection occurs in Earth's inner core
Granite and basalt conduct electricity
Earth's core contains a large amount of iron

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