What makes the Gobi Desert of Asia a desert?a. The growing season there is very short.b. It is hot.c. Temperatures vary little from summer to winter.d. It is dry.

Which of the following biomes has a structure made up primarily of the mineral deposits secreted by its dominant organisms?a. coral reefs;b. freshwater lakes;c. rivers;d. estuaries;e. oceans

Changes in the seasons are caused bya. the tilt of Earth's axis toward or away from the sun.b. annual cycles of temperature and rainfall.c. variation in the distance between Earth and the sun.d. an annual cycle in the sun's energy output.

Like Earth, Mars has seasons—its Northern Hemisphere experiences winter when its Southern Hemisphere experiences summer. Which statement is the best explanation for seasonality on Mars?a. Mars is tilted on its axis.b. Mars has an elliptical orbit that brings it closer to the Sun in summer than in winter.c. Mars has a circular orbit and maintains a constant distance from the Sun.d. The Southern Hemisphere of Mars consistently receives direct solar radiation.

In an ecosystem, how is the flow of energy similar to that of matter, and how is it different?

Scientists predict that global climate change will cause a greater increase in average temperature at higher latitudes than in the tropics. This seems like good news since most of the world's biodiversity occurs in the tropics. However, recent data suggest that a smaller temperature change in the tropics will cause a larger physiological response in organisms there than the larger temperature change will in organisms in temperate areas. Based on what you have learned about thermal niches in this chapter, propose a hypothesis to explain this result.

Which of the following sea creatures might be described as a pelagic animal of the aphotic zone?a. a coral reef fishb. an intertidal snailc. a deep-sea squidd. a harbor seal

The red lionfish, Pterois volitans, has beautiful red stripes, streaming fins, and a fearless disposition, and it is deadly. Native to the Pacific Ocean, the red lionfish was first discovered on coral reefs in the Bahamas in 1985. The species has spread to over 3 million square kilometers of the western Atlantic and Gulf of Mexico. Lionfish have a voracious appetite for native fish, are armed with venomous spines, and have no natural predators in their new range.Why are species like the lionfish considered 'invasive'?a. They are found in areas where they are not native.b. They were accidentally introduced by humans.c. They spread aggressively and displace native species.d. They are predators of other fish.

Why do the tropics and the windward side of mountains receive more rainfall than areas around latitudes 30° north and south and the leeward side of mountains?a. Rising warm, moist air cools and drops its moisture as rain.b. Descending air condenses, creating clouds and rain.c. There is more solar radiation in the tropics and on the windward side of mountains.d. Earth's rotation creates seasonal differences in rainfall.