2. Meaning ; “Bio” means “life” and “diversity”
means “number and variety”
Total number of species on planet of earth
2,500,000 (2.5 million)
Estimate showed the number of species from 5 to
30 million
4. A phyletic lineage is an unbroken series
From ancestors to descendants sequence
Each later species having evolved from one that
immediately preceded it
Record of the soft bodied organisms has not been
preserved as fossils