1. What is the general belief amongst scientists regarding the origin of life?
Simple organic molecules joined to form an organism and the simple organic molecules were formed from simple inorganic substances.
2. What is fossil?
The preserved remains and traces of ancient organisms.
3. How are fossil formed
(1) When an organism does, the dead body sinks to the bottom of a lake
(2) Soft tissue will decay, leaving the hard parts like the skeleton
(3) mud and sand buried the skeleton
(4) After million years, the mud and sand become rock due to great pressure from the upper layer of sediment.
(5) Earth movement raises the rock above water.
(6) Weathering exposes the fossil.
4. How can a fossil record provide evidence for evolution?
(1) The age of the fossil can be estimated from the fossils.
(2) There is a close resemblance between the modern species and the
fossilized species.
(3) Fossils that are found in younger rocks are more complex.
5. What is the limitation of the fossil record?
There are missing links (i.e. intermediate forms are missing)
6. What are other evidence for evolution?
(1) Homologous structures
(2) Comparative biochemistry (amino acid sequence / DNA sequence)