chapter 20 Flashcards
1
Q
Origin of first cells
A
Earth was hot, mostly ocean with volcanic gases and low oxygen
2
Q
what is the earliest evidence of life?
A
stromatolites: oldest fossils on Earth, layered prokaryotic bacteria, specifically cyanobacteria.
3
Q
each new group (taxon) began with
A
one ancestral species
4
Q
adaptive radiation
A
rapid increase in number of species due to great morphological and ecological diversity.
5
Q
how did major new forms arise?
A
EVO-DEVO, development and evolution.
