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32. What is the most difficult factor to measure for most populations? a. birth rate b. carrying capacity c. death rate d. doubling time a. 33. In the desert, many trees lose their leaves in response to cold temperatures b. lack of water c. loss of chlorophyll 34. What is the most important factor in determining the biome in a region? a. animals b. climate c. plants 35. Which type of soil has the smallest particles? a. clay b. sand silt c. TRUE FALSE 36. All producers are plants. 37. Tropical rain forests contain more species because the environment is continually changing, which offers a wider variety of microhabitats for organisms to exploit 38. One main difference between the temperate deciduous grassland and the temperate deciduous forest is in the amount of precipitation they recieve. 39. Primary succession occurs when pioneer communities push out established climax communities by outcompeting them. 40. The earth is essentially a considered as a closed ecosystem except for the sunlight and meteorites which reach it from space. 8