3. Which of the following is an indirect source?
A. A source that's cited in another source
B. A source, with no publication date
C. A source with no title
D. A source with no known author

answer:

b

Explanation:

bc that is what it is

answer:b

Explanation:

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.