“In chemistry, a chemical substance is a form of matter that has constant chemical composition and characteristic properties. It cannot be separated into components without breaking chemical bonds. Chemical substances can be solids, liquids, gases, or plasma.” from google
Answer:
Sirius is a binary star dominated by a luminous main sequence star, Sirius A, with an apparent magnitude of -1.46. Sirius A's apparent brightness can be attributed both to its inherent luminosity, 20 times that of the Sun, and its proximity. At just 8.7 light years away, Sirius is the seventh closest star to Earth.
Comparing the differences between the historical backgrounds versus the present time socioeconomic setting of family/ sex relationships will help understand the issues. (This is how Coontz evaluated her ideas: history vs. now) Will reduce insecurities, personal bitterness, and sense of betrayal by knowing the background and where issues originate.