Well there are many. First of all, in order for evolution to occur, genes must be passes on from parents to their children and so on. This soon would create new organisms. However considering human activities. Lets look at a variety of chemicals human activity releases into he air and damages the air and environment in which animals live in. If the environment is damaged this means that the animals which live in that specific area may be affected negatively. Sometimes even leading to death. If death occurs then genes cannot be passed on, and so that specific specie is more likely to extinct from the world. Another example is when human activist effects the growth of food. Sometimes there may be a lack of food and so animals will be endangered.Hope that helped.