Lecture 24A

Question 1

fossil record is the only source..

Answer 1

of direct evidence of what prehistoric organisms looked like for where they lived

2) help figure out phylogenies

3) place evolutionary events in
context

Question 2

first step of fossilization

Answer 2

organisms dies

Question 3

Second step of fossilization

Answer 3

organism Rots, and becomes buried in sediment

Question 4

third step of fossilization

Answer 4

years pass, the sediment turns into rock overtime. The bone matter is completely changed into mineral. This means the organism is now a fossil.

Question 5

what are the two main types of fossils

Answer 5

body fossils and trace fossils

Question 6

body fossils give us

Answer 6

direct evidence: fossil bones or shells

Question 7

trace fossils give us

Answer 7

indirect evidence: footprints, fossil poop, burrows, tracks

Question 8

limitations of fossil records

Answer 8

habitat bias
taxonomic bias
temporal bias
abundance bias

Question 9

habitat bias

Answer 9

better record for aquatic organisms

Question 10

taxonomic bias

Answer 10

better record for organism with hard parts

Question 11

temporal bias

Answer 11

better record for more recent organisms

Question 12

abundance bias

Answer 12

better record for common organisms

Question 13

25 percent is

Answer 13

2 half lives

Question 14

50 percent is

Answer 14

one half life