When you shake fish food into an aquarium, you are contributing to a(n)
A) open system.
B) negative feedback system.
C) positive feedback system.
D) closed system.
A) open system.
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What is the main difference between High-Density PolyEthylene (HDPE) and Low-Density PolyEthylene (LDPE)?
A. One is made from high-density ethylene, the other from low-density ethylene. B. HDPE has very long chains packed close together; LDPE has long chains that are branched and do not pack together well. C. HDPE is more useful than LDPE. D. LDPE is more useful than HDPE. E. HDPE has very long chains packed close together; LDPE has short chains that do not pack together well.
To say that electric charge is conserved is to say that electric charge
A) may occur in an infinite variety of quantities. B) is a whole-number multiple of the charge of one electron. C) will interact with neighboring electric charges. D) can neither be created nor destroyed.
A desert oasis occurs where the water table is at the surface. Indicate whether the statement is true or false
Algeria and Tunisia are predicted to have no unmet water demand in the decade 2020-2030
Indicate whether the statement is true or false