Suppose you wanted to determine whether you had adequately sampled the species richness of a given community. Which result would lead most strongly to the conclusion that the current sampling had adequately assessed the species diversity?

A species accumulation curve that had leveled off

Explanation:

In sampling, access if the current sampling had adequately assessed the species diversity, species richness is plotted as a function of the sampling effort, that is, each data point on a species accumulation curve represents the total number of individuals and sampling effort up to that point. Species accumulation curves can help us determine when most or all of the species in a community have been observed. A species accumulation curve that had leveled off indicates that you had adequately sampled the species richness of a given community.

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.