Which of the following is a characteristic of electromagnetic waves? A: they are all visible
B: they have a purely particle nature
C: they can travel with or without a medium
D: they cannot travel very fast

tube or goog will be great resources to find the answer to the question that you're asking

"i have always loved contemporary art and made it a general goal to work within the field. after a few nonprofit internships at museums and galleries, i decided to try the for-profit art world and was offered a job as the ad assistant at the magazine. i much prefer the pace of the for-profit art community and have stayed with the company for three years, with a promotion to an account manager last spring."

i just did this and got a 100.