What is a stem cell?

a.) special cells taken from the human umbilical cord
b.)pluripotent stem cells, not yet specialized cells that are the building blocks for the human body
c.)special cells that are present in fetuses but not babies or adults
d.)cell lines taken from the human brain stem

The chinese exclusion act was the first significant law restricting immigration into the united states. why do you think the us government singled out chinese immigrants in particular for exclusion?

How did southern slaveholders attempt to convince people in the north to support slavery?

Interest groups representing businesses and investors are often among the most successful lobbying groups for all of the following reasons, except a. such groups have the financial resources to mount sustained campaigns on their own behalf b. these groups' members contribute heavily to many legislators' campaigns and in so doing gain greater access to legislators c. these groups have often been in existence for decades, allowing them to both master the legislative system and develop close ties with legislators d. the members of these groups make up the majority of voters in many districts