7th grade science

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what are two ways a population may decrease in number? Explain the difference between direct and indirect observation in regard to determining population size.

Please help!!!
Thank you!!

  • 7th grade science -

    http://en.wikipedia.org/wiki/Demography

  • 7th grade science -

    thank you!! it helped me alot :)

  • 7th grade science -

    You're very welcome. :-)

  • 7th grade science -

    if 200mL of water were used instead of 100mL,how many grams of the compound would dissolve at 40c

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