evolution scientist point darwinian system diversity of species within species

Please answer each following questions in few statement paragraph:
1. which are more closely related to crocodiles: birds or lizards?
2. Feathers evolved for purposes other than flight, What are some possible functions for these early feathers?
3. List and describe three features of plants that help them avoid or reduce predation
4.What are the tree hey factors that influence species richness in an ecosystem
 
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