Whats the difference between dna and genes

dna let us know about the blood group

Explanation:

For kniw the blood group os parebts and childs amathching

c

explanation: because you need to reduce the pollution on land,the exhaust fumes will stop,and stop it in water,the oil that is in the oceanharms the fish   sorry if you   have been waiting long  

answer; because they must appeal to a broad cross-section of the population;