Warm Up 1/27

A tiny, nonliving particle that invades and then reproduces inside a living cell. Typically causes sickness.

• protozoa

• bacteria

• parasite

• virus

An organism, typically a biting insect or tick, that transmits a disease or parasite from one animal or plant to another.

• outbreak

• vector

• virus

• bacteria

Which of the following statements about pathogens is true?

• A pathogen describes anything that causes illness or disease
• Pathogens are all microscopic
• All pathogens are transmitted through the air from host to host
• All pathogens cause cells to swell and burst

After World War I, an outbreak of the Spanish Flu killed 50 million to 100 million people around the world. Which best describes this occurrence?

• Epidemic, because it happened within a relatively short time span.
• Epidemic, because it affected many individuals in multiple countries.
• Pandemic, because it happened within a relatively short time span.
• Pandemic, because it affected many individuals in multiple countries.

Water body (A) has a lower level of salinity than Water body (B). Which statement below is true.

• The DO level in A is lower than in B

• The DO level in A is equal to B

• The DO level in B is greater than A

• The DO level in A is greater than B