a brief account of evolution Flashcards
1
Q
first cellular forms of life appeared:
A
2000mya
2
Q
invertabrates
A
500mya
3
Q
jawless fish
A
350mya
4
Q
sea weeds and few plants
A
320mya
5
Q
first organisms that invaded land
A
plants
6
Q
fish with stout and strong fins could move on land and water
A
350mya
7
Q
which fish got caught and thought extinct?
A
1938, in south africa, coelacanth
8
Q
evolved into first amphibians
A
lobefins(coelacanth)
9
Q
lobefins
A
ancestors of frogs and salamenders
10
Q
what evolved into reptiles
A
amphibians
11
Q
how reptiles different from amphibians
A
they lay thick shelled eggs which do not dry in sun
12
Q
what fell to form coal deposits
A
giant ferns(pteridophytes)
13
Q
land reptiles–> fish like reptiles
(dinosaurs)
A
200mya
ex: ichthyosaurs
14
Q
biggest dinosaurs
A
tyrannosaurus rex
20ft
15
Q
dinosaurs disappeared?
A
65mya
