the first birds appeared in the fossil record in the late 19th century.
the first birds appeared in the fossil record in the late 19th century.
when did the first birds appear in the fossil record?
late 19th century
Na
Na
another systematic approach to classification was proposed in 1995, the hoek, mann and jahns system.









































section::::evolution and fossil record.









































section::::evolution and fossil record.:origin.









































heterokont chloroplasts appear to derive from those of red algae, rather than directly from prokaryotes as occurred in plants. this suggests they had a more recent origin than many other algae. however, fossil evidence is scant, and only with the evolution of the diatoms themselves do the heterokonts make a serious impression on the fossil record.









































section::::evolution and fossil record.:earliest fossils.
diatom