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The United States has less than 5 percent of the world’s population but accounts for almost ________ of the world’s prisoners.

What membranes line parts of the body that stem from or lead to openings in the environment such as the mouth and the respiratory tract.

What is the capital of Missouri?

In what direction would you expect water to flow relative to the cell?

Which of the following is no longer needed after birth?

What is the first organ system to reach functional state?

The sinus venosus receives blood returning from what?

Cellular junctions that allow for small molecules like ions to pass between cells are:

When red blood cells are put into a solution, they swell over time and some burst. With this information, you can conclude the solution is ______.

The optimal time to perform a complete fetal echocardiogram is __________ weeks.