Which clinical step is omitted for biosimilar agents?

There are normally four steps to approve (or not ) a medicine:
step 1: it must be proven that this drug is not toxic
step 2: it must be proven that this drug is active on sick people
step 3: it is compared to other drugs which have the same indication
step 4: is the pharmacovigilance. The drug is monitored during all its commercialization.

During the approval of biosimilar agents, step 2 is omitted because we need to establish that there are “no clinically meaningful differences” in the efficacy and safety of the biosimilar when compared to the original, which can be done in step 3.

The answer would be cstep by step explanation: all of the other animals developed their features while the salamander was born with them