The most common underlying reason is “Chronic Pain”.
B. He is intelligent despite his lack of education.
From "The Boy Who Harnessed the Wind by William Kamkwamba".
Members of the House of Representatives<span> serve two-year </span>terms<span> and are considered for reelection every even year. </span>Senators<span> but, serve six-year </span>terms<span> and elections to the </span>Senate<span> are staggered over even years so that only about 1/3 of the </span>Senate<span> is up for reelection during any election.</span>
Answer:
Scientists examine evidence from DNA, protein structure, fossils, early development and body structure.