1. Structural evidence: Embryonic similarities Vestigial organs
Homologous structures

2. Embryonic similarities
Observation:
Embryos of different species develop almost identically.
Inference:
Different species originated from a common ancestor.

3. Embryonic similarities:

4. Vestigial structures Observation:
Species have structures which have no function. But these structures are used in other species
Inference:
Species evolved from a common ancestor.
Ostrich wings are examples of vestigial structures.

5. Vestigial Organs:

6. Homologous structures
Similar structure, different functions
Observation:
Skeletal structures of different species are similar.
Inference:
Species evolved from a common ancestor.
Human hand
Bat wing
Mole foot

8. Genetic evidence: Nucleotide bases (A,T,C,G) Amino acids (20)
Similarities in nucleotide sequences of proteins

9. Nucleotide bases:
DNA structure and function is identical among all living organisms.

10. Same 20 Amino Acids

11. Similarities in certain protein structure: