How are derived characteristics used to determine evolutionary relationships?

Trough connections between pieces of evidence

Explanation:

The first thing that scientists have to do is to collect valid pieces of information of some organism, human or animal.

Then, collected information is being compared and then the scientists are making an evolutionary connection.

For the identification of homologous structures, they are using molecular data or morphologic data.  

for many centuries there were important factors which the economies of the muslim empires developed increasingly. they applied economic procedures in production, investment, finance, taxation and property. they used to tax certain goods (for example: harvest), they charged interest on money lent, they signed contracts with merchants; they relied on a common currency, and they used checks as well as promissory notes. with the money collected by means of taxation, the government provided the needy with an income. in addition, trading networks covered huge distances, so far regions started to have contact and exchange goods. this trade network covered areas of asia, africa and europe.

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