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Chemistry can be considered to be the study of chemicals.
yes
(For an example sentence with the word perspective, see the related question)
Business Perspective is study of all related subject of business to commence the Business.
Chemicals are directly related to Rio de Janeiro's physical features.
Hydrogen chemicals and carbondioxide
absolutely! Anxiety as well.
norepinephrine is the precursor.
perspective is the attitude to which a person has to the past events related around him and the World
Social anxiety disorder is often related to people that were shy as children. Clinical depression can also be linked to those who were shy children.
The word "anxiety" is from Latin. It has been used since the 1520s. Please see the related link below.
Anxiety related to twin pregnancy