A) liquid carbon dioxide
B) liquid oxygen
C) liquid nitrogen
D) ice
Correct Answer: C
Solution :
Semen is stored in semen banks for artificial insemination or artificial breeding, .e.g., Bulls semen is stored at -196°C temperature. This temperature is obtained by liquid nitrogen. Deep freezing is used for keeping seven day old embryos for several years. Deep freezing is also done at-196°C (temperature of liquid nitrogen).
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