A naturally occurring chemical compound composed of 2 oxygen atoms. It is normally found in its gas form.

An organism, often a bacterium or fungus,that feeds on and breaks down dead plant or animal matter. These organisms make essential nutrients available to plants and other organisms in the ecosystem

an ordered arrangement of animals and plants in which each feeds on the one below it in the chain

an animal that feeds on organisms that have already died or that have been killed by another animal. Vultures and hyenas are examples

an organism that feeds on other organisms or particles or organic matter

A large community of plants and animals that occupy a distinct region such as a desert, a rainforest, or a freshwater lake

substances such as proteins, minerals, or vitamins that are needed by people, animals, and plants to stay strong and healthy.

A naturally occurring chemical compound composed of 2 oxygen atoms connected to a single carbon atom. It is normally found in its gas form.

a chemical process by which green plants and some other organisms make their food. Plants use energy from the Sun to turn water and carbon dioxide into food, and they produce oxygen as a by-product

Relating to nonliving organisms

place where animals or plants live and interact

an animal that eats both plants and animals