Carl Linnaeus classified living things into kingdoms. Later, Carl Woese introduced a new classification system called the 'three-domain system' based on chemical analysis.
a.[2]
Which two of the following are domains in Woese's three-domain system? Tick (✓\checkmark✓) two boxes.
- Archaea
- Fungi
- Protists
- Eukaryota
- Viruses
b.[2]
Fossils provide valuable evidence of how organisms have changed over millions of years.
What is a fossil?
c.[1]
The ammonite shell shown above is a fossil. How was this type of fossil formed? Tick (✓\checkmark✓) one box.
- The soft body parts decayed and left an imprint in mud.
- The shell was preserved whole by being frozen in ice.
- Hard parts of the shell were replaced by minerals over a long period.
d.[2]
Ammonites became extinct millions of years ago. Give two factors that can cause a species to become extinct.