what are the necessary conditions for life on a planet?
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Life on Earth uses only two types of energy for metabolism: sunlight and redox chemistry ... One or the other has to be present, and if you're in the habitable zone of a star, you at least have enough light to support photosynthesis. So you have the right temperature, water, and sunlight.
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A special planet: the habitable Earth What makes the Earth habitable? It is the right distance from the Sun, it is protected from harmful solar radiation by its magnetic field, it is kept warm by an insulating atmosphere, and it has the right chemical ingredients for life, including water and carbon.
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Carbon is one of the most important elements to life on planet Earth. It forms more compounds than any other element and forms the basis to all plant and animal life.
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In addition, the atmosphere contains substances that are essential for life, including carbon, nitrogen, oxygen and hydrogen. The hydrosphere - this consists of those parts of the earth system composed of water in its liquid, gaseous (vapour) and solid (ice) phases.
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['Sustain life and growth.', 'Combustion.', 'Maintaining Temperature.', 'Supplier of Energy.', 'Photosynthesis.']
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Earth and life sciences cover all aspects of life on earth such as the complex and dynamic processes in solid earth, the oceans, the atmosphere, the natural world and organisms, including humans.
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['be organic. The organic molecules needed are amino acids, the building blocks of life.', 'have a metabolism.', 'be capable of replication (be able to reproduce).']
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It says a planet must do three things: It must orbit a star (in our cosmic neighborhood, the Sun). It must be big enough to have enough gravity to force it into a spherical shape. It must be big enough that its gravity cleared away any other objects of a similar size near its orbit around the Sun.
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['Distance from Sun: Earth is at the right distance from the Sun, the star it orbits. ... ', 'Atmosphere: The presence of an atmosphere makes Earth livable. ... ', 'Water: Presence of water is another key factor. ... ', 'Time for evolution: Earth is lucky to have a star as long-living as Sun.']
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Plants have specific needs - light, air, water, nutrients, and space - to survive and reproduce. Almost all plants need these five things to survive: Light.
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Life on Earth uses only two types of energy for metabolism: sunlight and redox chemistry ... One or the other has to be present, and if you're in the habitable zone of a star, you at least have enough light to support photosynthesis. So you have the right temperature, water, and sunlight. What else do you need?
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It is useful to categorize the requirements for life on Earth as four items: energy, carbon, liquid water, and various other elements.
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Most life on Earth depends on the atmosphere, a bubble of gases around our planet. This bubble, extending about 430 miles (700 km) into space, protects us from meteorites and warms Earth's surface. It includes the OZONE LAYER, which shields us from the Sun's harmful rays.
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While the development of tools, plumbing systems and food preservation have enabled modern man to live life with many creature comforts, the truth remains that the requirements for human survival are quite basic. Physiological needs include air, water, food, shelter, sanitation, touch, sleep, and personal space.
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['Water. Almost all the processes that make up life on Earth can be broken down into chemical reactions - and most of those reactions require a liquid to break down substances so they can move and interact freely. ... ', 'Carbon. ... ', 'Nitrogen. ... ', 'Phosphorus. ... ', 'Sulphur. ... ', 'Luck. ... ', 'Time. ... ', 'Location.']
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['Strength of the sun. ... ', "Changes in the Earth's orbit. ... ", "Changes in the orientation of the Earth's axis of rotation. ... ", 'Quantity of greenhouse gases in the atmosphere. ... ', 'Carbon dioxide content of the oceans.']
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What makes something living? All living organisms share several key characteristics or functions: order, sensitivity or response to the environment, reproduction, adaptation, growth and development, homeostasis, energy processing, and evolution. When viewed together, these characteristics serve to define life.