In older bird guides, the audubon warbler and the myrtle warbler were classified as two separate species. for many decades, the two species lived side by side within their habitat range. in more current bird guides they are classified as eastern and western forms of the same bird species.
since the two warblers are now classified as different forms of one species, they must
a) now occupy the same niche.
b) be identical in appearance.
c) be able to successfully interbreed.
d) consistently live in the same geographic range.

The diagram below represents a marine food web and a process that can harm the human population. each circle represents an organism and the smaller dots inside them represent a toxic substance. what is being represented and how does it harm the population? the diagram represents biological half-life, in which toxins build up in organisms higher up on the food chain, and this can negatively impact humans who consume the organisms and the toxic substance. the diagram represents biomagnification, in which toxins build up in organisms higher up on the food chain, and this can negatively impact humans who consume the organisms and the toxic substance. the diagram represents the process by which different organisms prey upon each other; this can impact the human population by reducing the number of organisms that do not contain the toxin. the diagram represents the way that toxins are metabolized by living organisms, with those at greater trophic levels able to metabolize more efficiently than those at lower levels. this means that those at higher tropic levels are safer for humans to consume compared to the organisms at lower trophic levels.

Creation of an unnaturally uniform sample to represent a diverse populationcan be avoided by: a. including only willing b. asking another scientist for .c. choosing only identical participants. d. selecting individuals at random.

How can you tell the difference between rough er from smooth er?