What transitional period occurred just before europe became climatically, geographically, and biologically much as it is today?

Mesolithic Era

Explanation:

The Climate, geographical condition, and biological diversity in  The Mesolithic era is drastically different from the current condition because the era was formed shortly after the Last Glacial Maximum.

Before last glacial maximum, the environment surrounding Europe is still covered in ice sheets. After the last glacial maximum period.  the temperature in this territory started to rise. Causing a change in climate, land forms, and the type of organisms that can survive.

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.

its d. you give me brainliest