Replacement fertility _. is below 2 in Africa is a contraceptive technique resto
ID: 180853 • Letter: R
Question
Replacement fertility _. is below 2 in Africa is a contraceptive technique restores population size after a catastrophic event is equal to 2.1 in stable populations is below 2 in Latin America and the Caribbean Biodiversity enhances food security because it _. reduces the number of pollinators increases the number of available pathogens decreases the number of predators can protect some crops against losses due to disease means that there is genetic uniformity the first national park was _. Yellowstone Sequoia Yosemite General Grant Mount Rainier Second-growth forests _. are forests that establish themselves after virgin timber has been removed from an area include the forests in Clay quote Sound are those forests in the National Parks that are protected from logging are less abundant on Earth today than they were 500 years ago, in North America are mostly in British Columbia and Alaska Natural sources of air pollution come from all of the following except _. cows salt from sea spray the metabolism of plants birds the decay of dead plants Hydroelectric power generation _. produces high quantities of greenhouse gases is an alternative to fossil fuels and produces fewer greenhouse gases has no undesirable environmental effects produces pollutants that contribute significantly to acid precipitationExplanation / Answer
19. D ( TFR for humans has decreased because of improved medical care and urbanization)
20. D (We have other species we can eat in case a certain one goes extinct and provide ecosystem services that are free.)
21. A (Yellowstone, was signed into law by President Ulysses S in the year of 1872)
22. A (stand of trees resulting from secondary ecological succession. after trees have been cut down or by natural disaster)
23. B (Salt never pollute air)
24. B ( Hydropower’s GHG emissions factor (4 to 18 grams CO2 equivalent per kilowatt-hour) is 36 to 167 times )