Which of the following is true concerning the noble gases? a. their highest occupied s and p sublevels are filled. b. they belong to group 8a. c. they are sometimes referred to as the inert gases. d. all of the above

If i had to guess prob all the above. Im guessing i could be wrong.

Usally when u see an answer that has 2 or more right in it on any given test its 90% usally the answer unless they swing two question in a row like that to try and throw u off.

tracks, burrows, eggshells, nests, tooth marks, or gastroliths