What affect does a mutagen have?

They can cause DNA damage which will either be repaired or result in mutations - these mutations can lead to inversions, duplications, deletions or translocations. If you don't understand that then...

it is s good to be alive

it affects DNA by changing the chemical structure of the bases.often these changes cause bases to mispair,or bond,with the wrong bases.

Radiation, chemicals ( such as tar and petroleum)

We effect animals by just going about out daily lives. We plant food for the herbivores to eat, which the carnivores then eat, and then the omnivores (us) eat them. Also, pollution can affect animals...