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After six hours the plants were frozen in liquid nitrogen, before being put onto photographic
film to make the autoradiograph. Suggest why the plant must be frozen quickly

Sagot :

SreeGangaidn

Explanation: I suggest:  A freeze occurs when the temperature drops below 32 degrees, and frost can happen when the air temperature (which is measured about six feet above the ground) is up to about 36 degrees. If part of your yard is lower than the rest, it’ll probably be coldest there since cold air is heavier and sinks down.

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