A situation where friction would be desirable is rubbing your hands together to make them warm in the winter time.
The complementary DNA strand is as follows:
TGA ATA CCT
How day length affects crop production most plant donot grow when day length is less than 10 hours . Even if the temperature is kept within the optimum range _ For example in a climate _ controlled greenhouse _ most plant will just sit dormat until the magic 10 hours of light perday arrives