The periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods.
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The filter bed is cleaned by occasional backwashing ;-; im sorry if this isn't a great answer but I tried
Answer:
ya, it's gravity. What is the problem??
Explanation:
New traits old traits to lose and save
