Like this study set? Create a free account to save it.

Sign up for an account

Already have a Quizlet account? .

Create an account

Ch. 15 Ecology terms.


close association between two species in which they live together on a permanent basis


heavy load of parasites


the outcome of an infection


very small parasites that have a short generation time; includes bacteria & viruses


large parasite that can be seen with the naked eye; includes flatworms & ticks


parasites that live on the outside part of the host's body


parasites that live inside the host's body

definitive host

host species in which the parasite becomes an adult & reaches maturity

intermediate host

host in which a parasite goes through some developmental stage of its life cycle


relationship in which one organism benefits & the other is harmed


relationship in which both organisms benefit


relationship in which one organism benefits & the other is unaffected


organism that benefits in a parasitic relationship


organism that is harmed in a parasitic relationship


organism, such as an insect, that acts as an intermediate host for a parasite but is not effected by it

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions and try again


Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

Voice Recording