S विज्ञान कन्कन लसले कस्तो अवस्थामा अवास्तविक आकृति बनाउद बनाउछ?उक्त अवस्थाका किरण रवा चित्रबनाई उक्त आकृतिको अझ प्रकृतिहरू लेहोरा यस्तो लेन्सको केन्दिरा दुरी 20cm भए समर्थ कति हुन्छ ? English​

Copper, silver, aluminum, cobalt, chromium, mercury 

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .