They are using the Scientific Method, Chronological Method, Research Method, and the Historical Method
All
Some living organisms are only one cell, or unicellular. Things like bacteria and amoebas are single cell organisms. ... Because cells are able to differentiate and perform different tasks, multicellular organisms can become very complex. For example, red blood cells can carry oxygen throughout the body.
D.
They have no competition and so can charge whatever they want.
Education or health services.
C. Citizens and their government agree to enter a social contract.
