Health department officials are trying to identify the source of an outbreak of an intestinal virus. Which is the most likely source of the virus?

Which best compares bacteria and viruses?

Humans occasionally become infected with common colds and flu after flying on crowded airplanes. Which microscopic biological hazard is most likely responsible?

Why are viruses considered to be nonliving organisms?

Which pair correctly matches a vector and the infectious disease it carries?

A recreational lake experiences eutrophication because of excess nutrients. Based on this information, how would the recreational lake most likely appear?

Lyme disease is spread by ticks and people affected with Lyme disease often exhibit a rash and symptoms similar to the flu. Which is the cause of Lyme disease?

The bacteria that causes bubonic plague is transmitted to humans by fleas. Which term best describes the role of the fleas in transmitting bubonic plague?

Which makes it possible for a person who has recovered from a cold to catch another cold?

Which aspect of fertilizer pollution would have the greatest negative impact on an aquatic ecosystem?

When wood is burned, it is changed into ash and carbon is released into the atmosphere as smoke. If 2 kg of wood were burned, how much ash would result?

Which form of energy production creates the most air pollution?

Which is most likely a consequence of using wind farms for energy production?

Why are the noble gases such as helium (He) and neon (Ne) grouped together in the periodic table?

In which group are the most reactive metals located?

Which is an anatomical similarity that indicates relatedness between two species?

If significant amounts of fossil fuels continue to be used to support energy needs, what will be a negative impact for our planet?

Which process starts the release of energy from food molecules for use in animals?

Which two elements are most likely ductile?

Which is the most exact method of determining the age of geologic features?

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