Topic 3

Question 1

all life on earth is related because it evolved from a _____ _____. Therefore, all are equally ____

Answer 1

• common ancestor

- complex

Question 2

Pre darwin thoughts on extinction

Answer 2

- recognized that extinction must occur 
 reasons differed: 
- natural disasters (cuvier)
- one species changing into another ( darwin)
- supernatural disasters 
- just hiding

Question 3

what did cuvier hypothesize

Answer 3

• species are fixed- no evolution/ no change over time
• fossils in earth’s strata because: catastrophe –> local extinction –> fossils
• after catastrophe, new species moved into the area so later new fossils in strata etc

Question 4

lamarck hypothesized:

Answer 4

species change over time (evolution) due to inheritance of acquired characteristics