Juan wants to compare the effectiveness of two drugs in treating migraines. he administers drug a to a participant and then drug b to the same participant eight hours later when drug a is still in the participant's system. in this case, the study is contaminated by a effect.

muslims have taken his goods and products to different parts of asia an indonesia. sometimes just traveled and trade, but in other occasions, stayed in the place and made a living.

trade was the key for muslims economies to prosper. their commerce routes reached far places like malaysia and java in the 11th century.

another important factor for prosperity was that muslim states served as the middle point for european traders.

they used to travel by land but sailing the seas -the indian ocean- really increase the exportation of products.

these are the choices

local priests

european monarchs

common people

bible translators

answer; (b) knowledge based summaries of our beliefs and feeling about the self in particular domains;