If a fossil sample originally contained 5 grams of carbon-14 and the half-life of carbon-14 is 5,700 years. after 11,400 years how many grams of carbon-14 would remain

Which statement is true about ionic compounds?

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.

Consider the story you just read. all but one of the choices below indicate that something is living.