The two strands of a dna molecule are said to be antiparallel what does this mean ?

The DNA molecule is composed of two strands held together by hydrogen bonds. A single strand is different at its two ends.  One end is called 5' (5 prime), the other end is called 3' (3 prime). 

The names come from the notation for the two sugar carbon atoms which participate  in the phosphodiester bonds. The different strands in the helix run in opposite directions (anti-parallel) such that at each end of the double helix, one strand is 5' and the other is 3'.

hi, natural selection of the peppered moth during the industrial revolution in 19th-century england is an example of an outlier in the study of evolution. during this time, pollution from factories filled the forests, coating trees in a layer of soot—turning white trees black

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