articles+ search results
558,922 articles+ results
Scientists once thought that the seed plants were monophyletic, derived from a single common ancestor. It is now known they are polyphyletic, derived from more than one ancestral group. The distinctions can be seen in the variations among seed...
Salem Press Encyclopedia of Science, 2019. 2p.
10. Chapter 3 - Weed Classification 
- Catalog results include