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validity is..

can anyone explain it to me??

i'm a freshman in high school

2007-02-04 02:49:55 · 1 answers · asked by Lina 4 in Science & Mathematics Biology

1 answers

I've been in science for 20 years and I've never heard of them.

Sorry, good luck. Ask your teacher for guidance.

2007-02-07 03:18:29 · answer #1 · answered by floundering penguins 5 · 0 0

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