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Bio 102


for most of human history there have been fewer than One Billion people on the planet
Our numbers started to climb in the 1800's
Repoductive decisions regarding fertility that are made by individuals obviously affect population size and growth
Female determinants of fertility include the timing of puberty, use of birth control, lowered fertility while breast feeding and the impact of education
Population pyramids are diagrams that provide summaries of current population sizes and serve as predictors of the potential for future population growth
The demographic transition model is the same as variation among nations as a nation moves toward a more "developed" economy, a decline in death rate occur's before a decline in birth rate
The greatest potential for global population growth is in developing nations
An ecological footprint measures average per capita amount of land need to provide people with the good and services they need and enable wastes to be disposed of
Biodiversity diversity of genes, of species, of communites/ecosystems and of ecological processes
Species numbers often are used as an index of an area's biodiversity
More than ___________ species have been described, with perhaps _________ lurking out there 1.5 million, 10 million
On land, species numbers are greatest in the tropics
Many of these tropical species are __________, with geographic distributions that are naturally restricted Endemics
If an endemic vanishes from its naturally restricted home then it's gone from everywhere
What is a pollutant? Something that is present in an area where it should be absent
The story of DDT By eating contaminated prey with DDT stored in fatty tissues, DDT became bioconcentrated in predators at higher levels in food webs
Why did populations of many predatory birds start to decline? DDT caused egg shells to thin and few live baby birds to hatch
Our strategy today for pesticide resistance Integrated Pest Management rather than outright pest eradication
A growing number of chemicals disturb the hormonal control of reproduction Either by mimicking the effects of natural hormones or blocking their effects
Hormone disrupters have been shown to affect cells growing in dishes, laboratory animals and wildlife
The average woman in the U.S. has around this chance of developing breast cancer 1 in 8
The latter states that if the consequences of doing nothing might be bad, then maybe it's best to act now even if were aren't 100% certain whether those bad consequences will actually come about
Carrying Capacity the maximum number of people an environment can provide
Endicrine Disruptor disruptes the hormone production
Created by: crescenti