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You administer a maximum of how many doses of nitro?

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Which group includes members that are important primary producers in ocean food webs, causes red tides that kill many fish, and may even be carnivorous? *a. ciliatesb. apicomplexansc. dinoflagellatesd. brown algaee. golden algae

In this 8-year experiment, 12 populations of E. coli, each begun from a single cell, were grown in low-glucose conditions for 20,000 generations. Each culture was introduced to fresh growth medium every 24 hours. Occasionally, samples were removed from the populations, and their fitness in low-glucose conditions was tested against that of members sampled from the ancestral (common ancestor) E. coli population. Which of these can be inferred from Figure 27.1?a. Most of the genetic change that permitted adaptation to the new, low-glucose environment occurred toward the conclusion of the experiment.b. Rates of mitosis increased over the course of the experiment.c. The highest rate of genetic change occurred during the first quarter of the experiment.d. After 5,000 generations, the bacteria were 100% more fit than the original, ancestral bacteria.

Diatoms are encased in Petri-plate-like cases (valves) made of translucent hydrated silica whose thickness can be varied. The material used to store excess calories can also be varied. At certain times, diatoms store excess calories in the form of the liquid polysaccharide, laminarin, and at other times, as oil. Below are data concerning the density (specific gravity) of various components of diatoms, and of their environment. Waterʹs density and, consequently, its buoyancy decrease at warmer temperatures. Based on this consideration and using data from Table 28.1, at which time of year should one expect diatoms to be storing excess calories mostly as oil?(see quiz for diagram)a. mid-winterb. early springc. late summerd. late fall

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