__________ is the prime factor in the reduction of habitat critical to the survival of Brazil's native species.
Fill in the blank(s) with the appropriate word(s).
Deforestation
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The largest amount of carbon is involved in
A) natural fire. B) biological processes in the oceans. C) respiration from land organisms. D) fossil fuels.
The United Nations projects that by 2030 the urban population will make up over ________ of the total Earth's population.
A. 20 percent B. 60 percent C. 40 percent D. None of these are correct
In contrast with the ________, the soil of the ________ is more nutrient-rich and this type of biome has fewer insects, parasites, and fungal diseases. Therefore, in many places, these areas are highly endangered.
A. Tropical seasonal forest; tropical rainforest B. Tropical rainforest; tropical seasonal forest C. Temperate grasslands; tropical seasonal forest D. Boreal forests; tundra E. Grasslands; boreal forests
For a neutrally-charged atom to become a positively-charged atom of the same element, it must:a
lose a proton. b. lose an electron. c. gain a proton. d. gain an electron. e. none of the above