#1: water to drink
#2: the atmosphere to keep us safe
#3:air and oxygen on earth to breathe
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Photosynthesis.
Liquid water, a suitable mix of atmospheric gases, proximity to the sun, the magnetosphere, Earth's size; all make life possible on Earth.
Sun makes energy that makes life.
the earth
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periods
Photosynthesis.
Air and liquid water.
Liquid water, a suitable mix of atmospheric gases, proximity to the sun, the magnetosphere, Earth's size; all make life possible on Earth.
Interconnected
Life is very possible on earth, if it were not, then we would not exist.
The combination of carbon with other elements like oxygen and hydrogen is what makes carbon based life possible on a planer similar to earth. The combination of these three elements usually leads to the complex molecules.
Oxygen is the main component of carbon dioxide, which plants use in photosynthesis. Oxygen is a by-product of photosynthesis. Oxygen is the element that makes most life, plant and animal, possible on Earth. So, photosynthesis not only helps life to flourish. For most organisms, it makes life possible.
The many regions on the Earth where life is possible are called habitable. The regions where life cannot be possible are called inhabitable.
Since the center of the Earth is in the molted form, it can not support life. Thus, it is not possible for life to exist on the center of the Earth.
The distance of the earth from the sun is enough to heat and cool the water in the earth. And the distance makes it possible for life to survive because it is the only distance where water is liquid. Try looking at the other planets in our solar system. Some has water in gaseous state. And some has it in solid state. Earth is the only planet in our solar system to have water in liquid state.