Immigrants to the U.S. in the 1830s-1850s came mostly from 

Why are oceanic islands frequently home to species found nowhere else?

Which of the following examples demonstrate adaptive radiation?

“The right of citizens of the United States to vote shall not be denied…on account of race, color, or previous condition of servitude” is a provision of:

The Jim Crow laws were

In a closed primary:

Catalysts used by cells to perform particular reactions are called _________________.

Psychologically, voters decide on the basis of:

Most reactions in the body occur too slowly on their own to sustain life. This is because

When carbon dioxide is low in the leaf, the Calvin cycle cannot proceed efficiently, ________ occurs.