2.  Caulogenesis

3.  Organogenesis

4.  Ecological succession

1.  Graphis

3.  Usnea

4.  Alectoria

2.  Species

3.  Division

4.  Class

1.  They cannot replicate

2.  They are primitive

4.  They do not have genetic material

2.  HIV

3.  Retrovirus

4.  Influenza virus

2.  Theodor Schwann

3.  Linnaeus

4.  Theophrastus

1.  Plannate

2.  Protista

3.  Fungi

2.  Ascending order

3.  No order

4.  All of these

1.  Easy to remember

2.  Universally accepted

4.  All of these

1.  Cannot inter-breed

2.  Live together

4.  None of these