Essential Question How does competition affect markets? > How does
the level and intensity of competition affect markets for goods and
services? Suppose you walked into a store selling running shoes under
each of the following conditions. For each example, briefly describe the
variety and quantity of running shoes you would expect to find and the
prices of the shoes.
• This store is one of eight independent stores selling running shoes in
the city.
• This store is one of three stores selling running shoes in the city, but
all three owners secretly work together to increase their profits.
• This store is the only one selling running shoes in the entire city.

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."

level 4 to level 2 : ))

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.