What is the large caldera that many scientists in the United States keep an eye on just in case (it
hasn't erupted in 65,000 years)?
A. Mount McKinley
B. Death Valley
C. Yosemite National Park
D. Yellowstone National Park

The pharynx is the structure in the body that serves as a pathway of both air and food. how does the body make sure that food does not get into the lungs? the salivary glands secrete enzymes that pull food out of the air pathway. the small intestine pushes the air out of the digestive system. the pancreas breaks down food in the air pathway. the epiglottis closes the air pathway so that food will not enter it.

Which skeletal system is represented by the shaded portion of the skeleton? spongy skeleton compact skeleton axial skeleton appendicular skeleton

In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?