Succession is the process of change in the species structure of an ecological community over time. A plant community gradually or rapidly replacing another can result from developmental changes in the ecosystem itself; or from disturbances such as wind, fire, volcanic activity, insects and disease, or harvest. Different plants require different ratios of fungi and bacteria, based on their successional growth traits. The biological approach seeks to match crops with their ideal soil habitat and associated microbial communities. Some plants are naturally acclimated to fungally-dominated forest soils; others are acclimated to grasslands that are more bacterially-dominated. The biology in the soil can enhance or impede plant growth based on the symbiotic or antagonistic relationships between microbes and plants. Conditioning the soil’s biology to compliment a specific crop will increase nutrient uptake, and can give the desired crop an edge over weeds they try to compete against.