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

Question

Please help!!!
Thank you!!

Answer 1

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

Answer 2

thank you!! it helped me alot :)

Answer 3

You're very welcome. :-)

Answer 4

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