With the links below, please define the following concepts using an example such as Darwin's finches, the Lemurs of Madagascar, flowering plants of Hawaii etc).

1) common ancestor

2) adaptive radiation

3) speciation

4) environmental niche

Recommended resources:

Adaptive Radiation: Darwin's Finches

http://www.pbs.org/wgbh/evolution/library/01/6/l_016_02.html

Article: Lemurs in Madagascar-Then

http://www.amnh.org/explore/science-bulletins/bio/documentaries/lemurs-of-madagascar/article-lemurs-in-madagascar-then/

Adaptive Radiation

http://ohia.org/ohia/roadshows/sky/seed/