CK-12 Foundation
Ck 12: Earth Science: Extinction and Radiation of Life
[Free Registration/Login may be required to access all resource tools.] Describes how species die out, and how new ones evolve to fill the vacant niches.
CK-12 Foundation
Ck 12: Earth Science: Extinction and Radiation of Life
[Free Registration/Login may be required to access all resource tools.] Describes how species die out and how new ones evolve to fill the vacant niches.