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massive


very large

 

congenital


a word that describes something a person is born with, such as a health condition

 

chronic


a word that describes something that doesn’t get better for a long time

 

infection


any disease caused by germs

 

insensitivity


not being able to feel something

 

predators


animals that hunt other animals for food

 

ancestor


member of a family who lived a long time ago

 

domestic


not wild; tame

 

evolution


the change that takes place in living things over long periods of time

 

intertwined


wrapped up together; tangled together

 

Al-Qaeda


a violent terrorist group

CIA


Central Intelligence Agency, a government organization that gathers information about other countries to help keep the U.S. safe

SEAL


a member of a U.S. Navy unit trained to carry out special secret missions