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Q: What is an indicator species how do they help assess pollution level?
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What is a bioindicator?

A biological indicator is a device to monitor the sterilization process that consists of a standardized population bacterial spores known to be resistant to the mode of sterilization being monitored. Biological indicators indicate that all the parameters necessary for sterilization were present.


Which level of classification has greatest similarity?

The levels of classification for all organisms is as following (from broadest to narrowest) Kingdom, Phylum, Class, Order, Family, Genus, Species. So organisms that have the same species will be most alike.


How would an adherent to punctuated equilibrium explain the lack of intermediate links in the fossil record?

Where are you people getting these ill posed questions? What level? Transitional forms! At the species level this would be explained as a rapid (geologically rapid) speciation event followed by years of stasis, where little morphological change is taking place.


What is correct order in which to assess level of arousal?

Determine the arousal state first, using minimal stimuli and increasing intensity as needed. Start with auditory stimuli, move to tactile stimuli, and use painful stimuli as a last resort.


What is a fossil that can be used as a marker in time called?

Index fossils (also known as guide fossils, indicator fossils or zone fossils) are fossils used to define and identify geologic periods (or faunal stages). They work on the premise that, although different sediments may look different depending on the conditions under which they were laid down, they may include the remains of the same species of fossil. If the species concerned were short-lived (in geological terms, lasting a few hundred thousand years), then it is certain that the sediments in question were deposited within that narrow time period. The shorter the lifespan of a species, the more precisely different sediments can be correlated, and so rapidly evolving types of fossils are particularly valuable. The best index fossils are common, easy-to-identify at species level, and have a broad distribution-otherwise the likelihood of finding and recognizing one in the two sediments is minor. --- Wikipedia

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