How many covalent bonds would the following atom usually form?
A) 1
B) 2
C) 4
D) 6
E) It would tend to form ionic bonds.
E
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Briefly describe the sector model for the internal social structure of cities
What will be an ideal response?
The most effective way to reduce malaria in a region is by using
A) Salmonella control to treat infections and treatment strategies to prevent infections. B) vector control to prevent infections and treatment strategies for infections. C) antiviral medicines to reduce fevers and prevent disease transmission. D) better hygiene, improved sanitation practices, and uncontaminated sources of water.
Is extinction natural? How has the extinction rate changed over time? Why are extinction rates today different than in the past?
What will be an ideal response?
Assuming 10-percent trophic efficiency, the other 90 percent of the energy associated with a given trophic level is ________.
A. lost as heat B. transferred to lower trophic levels C. converted to bioluminescence D. transferred to higher trophic levels