Estimate the total number of bacteria and other prokaryotes in the biosphere of the earth. (assume the bacteria are found to a depth d = 1000 m below earth's surface, and that there are an average of 100 bacteria in every 1 mm3 of volume.)

Laboratory experiments, observational field studies, and model-building are all examples of different forms of scientific investigations.  in what way do laboratory experiments primarily differ from other forms of scientific investigations?   a.  a laboratory experiment is the only accepted form of investigation within the scientific community.  b.  studies about how things behave in nature or studies involving very large objects are best answered through laboratory experiments.  c.  laboratory experiments involve the identification and control of variables.  d.  data can only be generated through laboratory experiments, not other forms of investigation.

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost

Which of these activities increases the amount of carbon in the atmosphere?