I would say mostly economic factors: common currency, common market, wide-scale trade among the countries. If one country is hit, the others will also suffer: this brings in the feeling of solidarity.
other than that, European culture is actually quite unified, with many shared valued, such as universal health care and religious freedom, yet connection to Christianity.
Answer:
corpus callosum
Explanation:
Yolanda, who is 5 years old, has improved dramatically in her ability to throw and catch a baseball. The growth of the corpus callosum has contributed significantly to her improved abilities by enhancing communication between the left and right hemispheres of the brain.
The correct answer is C. Early European colonists