Atom to elements concept map (plz and thx)

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

Which of the following describes the difference in stimuli required to detect a difference between the stimuli? a. just noticeableb. signal detectionc. subliminald. top down

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.