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Really, this stuff is quite obvious. Even if you're not very good at science, this isn't a very hard quetsion to answer. 1 is individual because it is an observation of ONE organism, not a population as a whole, and it is only throught eh naked eye. 2 is molecular. DUH! you can't look at this...

Deforestation leads to less O2 because trees and other photosynthetic plants make O2 for us to use. Less O2 leads to less people. Too much CO2 leads to a hotter world, and melting ice caps, which means that one of our most important clean water (or non-salt) is gone. Less drinkable water leads...

Taking cuttings? I don't think that has anything to do about culturing... Maybe I am wrong. Anyway, a tissue culture usually starts out with a sample, so you swab the site with a sterile swab. You place the sample (like, roll the swab in a petri dish) in a petri dish and add some solution which...