List two human made disturbances that can lead to succession.

When we build buildings on natural environments, it can ruin the food chain and the plants that grow there. Also hunting causes problems, especially since we usually hunt certain types of animals for skins, food, etc. It messes with the natural society and when one animals starts to go extinct or endangered because of it, there is either too little or too many prey or predators.

2hydrogen and 1 covalent