What is a pathogen?
A microorganism that causes disease
A virus that causes disease
A microorganism that causes infection
In which two ways do pathogens cause disease?
Damaging host tissues and producing viruses
Damaging host DNA and producing viruses
Damaging host tissues and producing toxins
What is a correlation?
When one variable changes
When a change in one of two variables is reflected by a change in the other variable
When a change in two variables proves there is a link, and is backed up with experimental evidence
What is a causal link?
Where one variable changes, and a change in another variable is present
When a conclusion can be made from a graph
When experimental evidence proves one thing directly caused another
What is risk?
A measure of the probability that damage to health will occur as a result of a given hazard
A measure of how likely it is for a hazard to occur
A measure of how likely it is for health to be affected
What is the single most effective way of increasing life expectancy?
Drinking one unit of alcohol per day
Giving up smoking
Increasing physical activity
