Which statement best describes the desert biome?a. It is found wherever temperatures are high;b. It contains a larger amount of biomass per unit area than any other biome;c. Its dominant vegetation is adapted to conserve water;d. Most are located at the equator;e. It is not suitable for human habitation

Tundra is found .a. where average temperatures are low and growing seasons are short;b. near the poles;c. at high altitudes;d. A and B are correct;e. A, B, and C are correct

Suppose that the number of bird species is determined mainly by the number of vertical strata found in the environment. If so, in which of the following biomes would you find the greatest number of bird species?a. tropical rain forestb. savannac. desertd. temperate broadleaf forest

The open ocean and tropical rain forests contribute the most to Earth's net primary production becausea. both have high rates of net primary production.b. both cover huge surface areas of Earth.c. nutrients cycle fastest in these two ecosystems.d. the ocean covers a huge surface area and the tropical rain forest has a high rate of production.

Temperate forest in China and temperate forest in North America are part of the same biome but are distinct ecosystems. Explain.

Compare the distribution of the natural terrestrial biomes of eastern North America with the distribution of anthropogenic biomes.

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.