This category is based on the study of relationship of animal and plant populations with each other and with their environment. The projects might study food chain, food web among different communities of plants and animals. The projects might study on biodiversity among animals and plants. The projects might focus on communication and behavior of the organisms in their populations.

Excessive fishing

Excessive farming

Genetic pollution and hybridization and their effects on biodiversity

Climate change and their effects on biodiversity

Deforestation

Distribution and abundance of organisms

Extinction

Destruction of habitat and etc.