1) Are they reliable?
2) Are they relevant?
3) Are they recent?
4) Are they sound resources?
5) Are they a primary source?
6) Are they a secondary source?
A derived character refers to a particular character that is shared by members of a particular population. Genes are considered to be derived characters because THEY ARE TRANSFER FROM GENERATION TO GENERATION FROM PARENTS TO THEIR OFFSPRING. Genes are derived from the DNA molecule of the parents and these are passed to their offspring during the process of cell division in reproduction.
The work output of a machine divided by the work input is the resistance of the machine
