[Izzy]

http://www.ethnobiomed.com/content/3/1/14

I found this using googles scholarly beta search. Seems to be exactly what I need even if it is a little detailed. Just need to paraphrase a little.

I had no idea google had such a feature.

Biodiversity loss diminishes the supplies of raw materials for drug discovery and biotechnology, causes a loss of medical models, affects the spread of human diseases, and threatens food production and water quality [10] . Its reduction has direct effects on the discovery of potential medicines.

My speech is actually a persuasive speech about saving endangered plants / animals and one of my main points is that it has medical benefits. This quote seems to support that.