Lead can damage the nervous system and lead to lower IQ scores. Research in the United States indicates that the concentration of lead in black children's blood is ________ higher than in white children's blood.
A) 50%
B) 35%
C) 20%
D) 5%

Question

Quizplus · Accepted Answer

Research in the United States has shown that the concentration of lead in black children's blood is 50% higher than in white children's blood.

Lead Can Damage the Nervous System and Lead to Lower