A flea and dog are a. example of

Parasitism

Explanation:

A flea and a dog go with this example because a flea irritates the dogs skin and feeds on its blood. (Just like how some sea animals carry bacterial diseases. Like Shrimp or something)

Hope this helped xoxo! :)

you are the source of the heat energy. you can minimize the heat energy by selecting the appropriate clothes to wear.

the answer is:

carbon dioxide