Which of the following statements supports the concept that organisms are still evolving?

the increasing population of humans.
the decreasing number of fossils found in rock.
the increasing need for new antibiotics and medicines.
the decreasing number of new species being discovered.

What reaction is taking place? 02 + c3h8 = h20 + co2

Which of these conditions most likely produces an unstable isotope?

Lab reagent, hypothesis test. a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl. these six measurements are assumed to be an srs of all possible measurements from solution. they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution. carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.