Select 4 that apply.
What four gases are essential to all life on earth?
chlorine
hydrogen
carbon-dioxide
sulfur
nitrogen
oxygen
carbon-dioxide, nitrogen, oxygen, hydrogen
_____ are the link between the energy of the sun and every organism on the earth.
Water and salt
Light and water
Gases
Animals
Plants
Plants
To determine the four gases that are essential to all life on Earth, we need to go through the options given and identify which gases fulfill this criterion.
1. Chlorine: Chlorine is not considered an essential gas for all life on Earth. While some organisms might use it in small amounts, it is not universally required.
2. Hydrogen: Hydrogen is not an essential gas for all life on Earth. It is the most abundant element in the universe, but it is not directly essential for supporting life.
3. Carbon dioxide: Carbon dioxide, usually written as CO2, is a gas that is essential for life on Earth. It is used by plants during photosynthesis, and many organisms rely on plants for food or directly consume CO2 themselves.
4. Sulfur: While sulfur is necessary for some organisms, it is not universally essential for all life on Earth.
5. Nitrogen: Nitrogen, usually present in the form of N2 gas, is a crucial element and is considered essential for life on Earth. It is a major component of proteins and nucleic acids.
6. Oxygen: Oxygen is one of the most important gases for supporting life on Earth. It is used in the process of respiration for many organisms, including humans.
Based on this analysis, the four gases that are essential to all life on Earth are: carbon dioxide, nitrogen, and oxygen.