Scientists know that there has been a steady rise in atmospheric CO2 level since 1850 because ________
a. carbon isotope dating techniques indicate that this is so
b. pockets of ancient atmosphere remain in Antarctic ice
c. graphs of current increases can be extrapolated back in time
d. reports by early researchers are stored in libraries
b
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Four small bags are filled with a 10% starch solution. The membrane of each bag contains microscopic pores large enough to let smaller water molecules cross but too small for the larger starch molecules to cross.Each bag is placed in a separate beaker as follows:Bag 1 is placed in distilled water containing no starch (0% starch).Bag 2 is placed in a solution of distilled water and 5% starch.Bag 3 is placed in a solution of distilled water and 10% starch.Bag 4 is placed in a solution of distilled water and 50% starch.The bags are weighed initially and at regular intervals for a specific period of time. Some bags saw a change in weight, and some did not. Answer the following questions based on the expected outcomes of this experiment.a. Which bag should weigh approximately the same at the
end of the experiment as it did at the beginning of the experiment?b. Which bag is expected to be the heaviest at the end of the experiment?c. Which bag is expected to be the lightest at the end of the experiment? What will be an ideal response?
What key words does the question contain and what do they mean?
What will be an ideal response?
Describe why many systematists adopt the principle of parsimony?
What will be an ideal response?
During cell reproduction, chromatin fibers coil up into structures called
A) ribosomes. B) lysosomes. C) chromosomes. D) nucleoli.