Biology
AIDS is caused by the Human Immunodeficiency Virus (HIV). The transmission of HIV infection generally occurs through

Inhaling polluted air
Eating contaminated food and water
Shaking hand with infected person
Transfusion of contaminated blood and blood products

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Biology
Which statement describes decomposers?

Decomposers are insignificant organisms in the ecosystem and can be absent in some ecosystems
All listed here
Decomposers are those organisms that recycle matter in the ecosystem
Decomposers can produce their own source of energy and can sometimes act as primary producers

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