Answer:
True
Explanation:
Smiling is considered as a universal sign of happiness. Smiling is something that makes a person happy internally. During birth babies smile. Some people smile even during sleep. It has been observed that when people are exposed to something they love or enjoy, they usually smile such as song, music, old photographs etc. Smiling is not a learned behaviour , it is considered as a sign of pleasure and openness across various cultures.
Hence, the given statement is true
Destructive interference is w<span>hen two </span>light<span> waves superpose with each other in such a way that the crest of one wave coincides the trough of the second wave, then the amplitude of resultant wave becomes zero</span>
Butterflies have different breeds just like how humans have difference race, also can reproduce.
the difference is that butterfly have wings and humans don't. <span />
Letter c ! both contracts and relates ! hope this helps!
