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What are living things? (Oxygen (The air is composed mainly of nitrogen…
What are living things?
Oxygen
The air is composed mainly of nitrogen and oxygen.
Living things use oxygen to obtain energy from carbon compounds through the process of respiration.
Water in a liquid state
Water makes up a large part of the body of a living thing.
Water is essential for living things to perform life processes, such as germination of plants or the elimination of waste products in animals.
A suitable climate
Most organisms live within the temperature range of –18 ºC to 50 ºC.
Most living things cannot survive temperatures above 100 ºC or below –30 ºC.
The average temperature on the Earth's surface is about 15 ºC.
Mineral salts
Soil and water from rivers and seas contain the mineral salts that living things need.
Plants absorb mineral salts through their roots.
Animals obtain mineral salts by eating plants and other animals, and by drinking water.
Light and carbon dioxide
Therefore, sunlight is also necessary for animals.
Animals feed on plants or on animals that eat plants.
