B4 Revision

Biological control involves the introduction of living deceased large( living, deceased, large ) organisms into an area affected by drought pests humidity( drought, pests, humidity ). The biological controls attack and eat feed and provide food for ignore( attack and eat, feed and provide food for, ignore ) the pests, eradicating the issue from the area. However, if too successful, these controls can eliminate increase support( eliminate, increase, support ) the food supplies of native species. They may also attack the native species. If proper research is not carried out prior to their introduction, they may prove to be ineffective colourful effective( ineffective, colourful, effective ) or a pest organism crop( pest, organism, crop ) themselves.

Herbicides and fertilisers have advantages and disadvantages. Herbicides can kill weeds, but can also kill crops. The fact that herbicides can kill crops is a disadvantage advantage( disadvantage, advantage ). Fertilisers increase plant growth, but can cause water pollution. The fact that fertilisers increase plant growth is an disadvantage advantage( disadvantage, advantage ). The fact that fertilisers can cause water pollution is a advantage disadvantage( advantage, disadvantage ).