Violins, guitars, and harps produce sound by vibrating /false

Natural forces that can alter ecosystems include seasons and climate changes. t or f

Which of hubble’s discovery support the big bang theory

It's time for santa to deliver his presents. assuming he delivers presents all over the world, he has to travel about 75,000,000 miles. if he travels east to west, he can use the time zones to make christmas day last 31 hours. what speed, in miles per hour, must santa fly to get all of his presents delivered?