"Sometimes during DNA replication a change in the DNA nucleotide sequence, which is called a mutation, can occur. There are various reasons why mutations occur. In certain instances, a chemical called can increase the mutation rate."

Mutagen

There are various reasons why mutations occur. In certain instances, a chemical called mutagen can increase the mutation rate."

Explanation:

A mutagen is a chemical agent that changes the genetic material, usually DNA, of an organism and this increases the frequency of mutations above the natural background level.

Other causes of mutation include:

- error in DNA replication, repair and recombination

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1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.