2007-04-22 15:39:31 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Biology
I'm not sure exactly what you're asking.
If you mean taking multiple samples from different locations, it could be because the various microenvironments in the ocean are all different. For example, one region (say, a higher up region) may have more photosynthesizing bacteria, whereas a deeper region might have more anaerobic sulfur reducers.
If you're talking about treatments of the water, I'd say you're looking for the presence of a particular microorganism or contaminant that may not be evenly distributed throughout the water, since it is in low density.
2007-04-22 15:43:39 · answer #1 · answered by Sci Fi Insomniac 6 · 0⤊ 0⤋
It's always a good idea to do tests twice to be sure you are correct and that nothing went wrong. It's kind of like working a problem twice on the calculator to be sure you come up with the same answer again.
2007-04-22 22:57:55 · answer #2 · answered by ecolink 7 · 0⤊ 0⤋
to make sure that the first sample is not contaminated and to reinforce the result of the first
2007-04-22 22:44:13 · answer #3 · answered by (♥_♥) 6 · 0⤊ 0⤋