What are the some factors that would affect or limit the population growth of frogs, grasshoppers, or plants?

Some factors that would affect or limit the population growth of frogs,grasshoppers,or plants are:There are various reasons which is responsible for setting limitation for the growth of frogs, grasshoppers or plants are surrounding climate, bigger preys, change in food chain, weather and many other factors. As the condition of earth is worsening year after year, our earth is getting hotter and hotter. These all cause is due to the pollution created by all human. With the harmful atmosphere where all the plants, insects live has been effected.