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Practice Quizzes

a biome is described by

broadly similar environmental conditions

location of specific biomes can be predicted based on

precipitation and temperature

tree growth in the taiga is limited by

extreme cold and short summers

tundra biomes occur

at high latitudes, where temperatures are low

coral reefs form in what type of areas?

warm, clear, tropical seas

barrier islands are formed of?

wind- and wave-deposited sand

what environmental factors change as you go deeper in the lakes

light penetration
nutrient availability
oxygen content

historically, up until the middle ages, populations were mostly limited by what?

disease, famine, and war

human population growth most closely resembles what?

J-shaped curve growth

The population theory held by Thomas Malthus was the human population would what?

overshoot its carrying capacity, then suffer starvation and misery

what did malthus say was the ultimate cause of social and environmental problems?

excess population growth

What did marx say about population growth?

he said that it results from social and environmental problems

what country is predicted to be most populous in 2050?


crude birth rates are measured in terms of the number of children born

per 1000 people per year

the zero population growth rate in more highly developed countries is?

2:1 children

what is the difference between total growth rate and natural increase?

total growth rates include immigration and emigration as well as births and deaths

life expectancy

rises with increased income but only up to $4000

the demographic transition refers to a country's change from

high birth and death rates to low birth and death rates

the harvard food pyramid emphasizes that you should sparingly consume these following foods

red meat
white rice

most common dietary problem in rich countries


food security

the ability to obtain sufficient food on a day-to-day basis


a nutritional imbalance caused by a lack of specific dietary components

3 crops that provide the majority of humanity's nutrients and calories



growing aquatic species in net pens or tanks

condition of being overweight

-no longer restricted to the wealthy nations of the world
-is spreading along with western diets and lifestyles
-substantially increases the risks for a number of diseases
-results from lifestyles that involve less walking, less physical work, and more leisure

green revolution

increased yields as new agricultural varieties spread around the world

genertic engineering

moving genes from one type of organism to another

is genetic engineering and the GMO's produced safe?

we don't know

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