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Environmental Science Chapter 20 &21 Quiz

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1.
1 point
Apx. __________ people live on the Earth right now
2.
1 point
Toxic chemicals can be carried from city to city by waste water
3.
1 point
What contributes to the spread of TB
4.
1 point
Mosquitoes are an example of a host
5.
1 point
The study of the spread of diseases
6.
1 point
Toxicology is the study of the harmful effects of substances on organisms
7.
1 point
_________is the condition in which human needs are met in such a way that a human population can survive indefinitely
8.
1 point
Pathogens cause infectious diseases
9.
1 point
Governments often try to influence economics
10.
1 point
An example of cross species transfer is
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