After a meal, the stomach normally empties in 8 to 12 hours.

In the ocean, on either side of the Isthmus of Panama, are 30 species of snapping shrimp; some are shallow-water species, and others are adapted to deep water. There are 15 species on the Pacific side and 15 different species on the Atlantic side. The Isthmus of Panama started rising about 10 million years ago. In Figure 22.1, the isthmus separates the Pacific Ocean on the left (side A) from the Atlantic Ocean on the right (side B). The seawater on either side of the isthmus is separated into five depth habitats (1-5), with 1 being the shallowest.   Figure 22.1   In which habitat should one find snapping shrimp most closely related to shrimp that live in habitat A4?

A narrow hybrid zone separates the toad species Bombina bombina and Bombina variegata. What is true of those alleles that are unique to the parental species?

The primary function of vitamin K in the body is to:

People with celiac disease cannot digest ____, a protein found in grains.

What food would be the best protein complement to pasta in a meal?

The way to distinguish the different amino acids is by their:

If nitrogen intake exceeds nitrogen excretion, the body is said to be in _____ nitrogen balance.

The term “moderation” as part of menu planning means selecting a variety of foods at each meal.

How much alcohol is in beer, wine, and liquor?