20. Choose the correct statement (1) Methodical vibration of particles in objects creates noisy sounds
(2) Some musical tones are unbearable
(3) Heavy sounds are pleasant to ears
(4) Non formal vibrations create rhythmical sound​

Polar bears give birth and hunt on sea ice. which of the following would polar bears survive during the melting of arctic ice? growing another layer of fur during summer migrate inland to search for different food sources staying put until the ice refreezes sticking to the usual diet of seals