Plants remove carbon in form of carbon dioxide from  atmosphere during process of photosynsis.

Planktonic algae are microscopic organisms and are foundation of aquatic food chain in all lakes, ponds, and rivers. However excess growth can lead to an algal bloom. They utilize oxygen at night and reduce dissolved oxygen content.

Pesticides (chemicals that kill insects) applied to crops in farmlands, contaminate surface water and ground water often in large quantities, leading to pollution.

An endangered species is species whose population faces a sudden downfall. In case of wild animals, ir habitat is forest and deforestation of forests due to ecological disasters, or use of timber for construction of buildings makes m insecure in ir homestead.