To measure primary production of algae in a stream, you place two sealed chambers in the stream, each enclosing the sediments as well as the water above them. one chamber is covered with black tape (blocking all light) while the other is transparent to light. you measure dissolved oxygen (do) before and after a 24-hour incubation. do in the light chamber increased by 1.5 g/m² while do in the dark chamber decreased by 2.0 g/m². (hint: you have all the information you need to answer the following 3 questions—you do not need initial and final do values. think carefully about what is actually being measured in each of the two chambers! )
what is the estimated ecosystem respiration (re) for the stream?

what does the table look like

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).