The Proterozoic division of the geological time scale is an era of the Phanerozoic eon. The Proterozoic division began 2.5 billion years ago and ended 542.0 million years ago.
Answer:
The correct answer is Introspection
Explanation:
From the given question, from the history of psychology, we can asses Dave's claim using what is called Introspection
Introspection refers to the training of participants to report elements of specific sensory experiences.
Introspection is also the scrutiny of one's personal feelings and conscious thoughts. In psychology, the process of introspection deals with exclusively on observation of one's mental state, while in the context of spirituality it may be called the examination of one's soul.
A polyatomic ion is a group of atoms bond by covalent bonds with an unbalanced charge. A binary ionic compound is composed of atoms of two elements bond by an ionic bond.
They would be concerned becuase they affect they area with the symptoms/problems and they would aid them because they are most ways common symptoms are found and usually help find more problems