A_ property is a characteristic of st substance that can be observed and does not change identity of a substance

physical

Explanation:

Physical property is the property of a substance which does not involve rearrangement of atoms and deals only with size, shape and state of the substance. Thus the identity of the substance does not change. Example: Melting point, hardness

Chemical property is the property of a substance which involves rearrangement of atoms and thus new substances are formed. Thus the identity of the substance change. Example: Oxidation , Precipitation

all of the answers are correct.

falsification is manipulating research materials, equipment, or processes or changing or omitting data or results such that the research is not accurately represented in the research record. plagiarism is the appropriation of another person's ideas, processes, results, or words without giving appropriate credit.

explanation:

the five characteristics of adolescence are biological growth and development, and undefined status, increased decision making, increased pressure and the search of self.