Arrange the following organisms in order from earliest to latest appearance: amphibians, jawless fish, trilobites, bony fish.

1) Trilobites

2) Jaw-less fish

3) Bony fish

4) Amphibians

Note: May have gotten 2 and 3 mixed up.

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.