Human activities that have i【小题1】 effects on animals can be just as harmful. When we build farms or factories, we destroy animal habitats and leave many animals with n【小题2】 to live, or no food to eat. We can also put animals in d【小题3】 without entering their habitats. Air, water, noise and light pollution can all have a deep and damaging influence quite f【小题4】 from their source. Partly due to pollution caused by ship traffic and other human activities, the dolphin population has d【小题5】 greatly. As the human population continues to grow, so does the effect we have on animals.