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That they don't change. A point to be borne in mind when talking about events "close" to the "big bang".
The change of inherited characteristics of species over long periods of time is called evolution.
endurance
According to the theories of Charles Darwin complex forms of life evolved over long periods of time from simpler forms.
Homologous Structures
Preserving foods allows you to store them safely for long periods of time.
Touch typing has advantages: you can type quicker and this is good when you are typing long essays on the computer.
Touch typing has advantages: you can type quicker and this is good when you are typing long essays on the computer.
Some people like to take study breaks when studying for long periods of time. A clock can help determine when to take a break, and also when to return from your break.
Its generally not unless you play it for long periods of time without taking a break this can damage your eyes.
Some known issues witih PSPs include UMD's that tend to be flimsy and break after long periods of use.
The best article I've read on the web concerning 4-stroke engine break in, can be found here: http://www.mototuneusa.com/break_in_secrets.htm--Rayengine break in is very important, proper break in will help ensure long engine life.
A soccer match consists of two 45-minute periods, which are called halves, with a 15-minute break in between.
No.
Long periods of low precipitation are called "drought".
Usually break outs happen when you're run down by stress or have been out in the sun or cold tempuratures for long periods of time.
they dont have periods.