Read the following scenario and answer the question below. The western United States contains a series of tall mountain ranges that also extend far down into Mexico. Two of the largest of these ranges are the Rockies and the Sierra Madres, but they are all part of the same mountain-building event that occurred many millions of years ago, and they all have similar features. Much of the vegetation on these mountaintops is the same, or very similar, and they are often referred to as the “Sky Islands” because of their similarity to each other and their isolation from the lower, drier areas surrounding them. There are groups of tropical birds, such as trogons and parrots, that are usually considered to live in Central America and the mountains of southern and central Mexico. Small populations of these birds migrate into the United States each year. It is probably TRUE that ________.

Fracking is used in the extraction of ________.

Which of the following regulates the discharge of wastes into rivers and streams?

Read the following scenario and answer the question below.  Many geologists have proposed naming the current time period of Earth’s history the Anthropocene epoch. The rationale for doing so includes the fact that erosion rates and greenhouse gas levels in the atmosphere have increased rapidly over the past 300 years. Almost all environmental scientists agree that increases in greenhouse gases contribute to global climate change. Carbon dioxide, methane, nitrous oxide, hydrochlorofluorocarbons, and water vapor are the main culprits. Human activities, chief among them the extraction and burning of fossil fuels for energy, have significantly increased these “greenhouse gases” in our atmosphere in the last 300 years. With rising standards of living in developing countries, emissions of carbon dioxide and other greenhouse gases are expected to continue to rise. If unchecked, carbon dioxide levels will reach twice preindustrial levels by midcentury and double again by the end of the century. Computer models have shown that this rise alone could raise Earth’s temperatures by 3 to 10 degrees Fahrenheit by 2100. Preindustrial levels of atmospheric carbon dioxide have been estimated to be approximately 275 ppm (parts per million). If unchecked, carbon dioxide levels are expected to reach ________ ppm by the year 2100.

Which type of diversity is the number and variety of ecosystems?

Which of the following is the primary factor that differentiates one amino acid from another?

Which hormone signals glycogen breakdown?

Fiber helps reduce risk of all the following except:

Which of the following is a feature of fat intake and health?

Which monosaccharide combines with glucose to make lactose?