An object has a mass of 295 lbs. Convert this into kilograms (show work) ((last question))

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.

What is the most common reason for matter changing its state?

When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?