Why are most life forms on the Earth intimately linked to a star that is 150 million kilometers away?

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trophyhunter1 eNotes educator| Certified Educator

The sun which is a star that our solar system revolves around, is the primary source of energy for our planet. Light energy is captured by photosynthetic organisms like green plants and algae and due to the process of photosynthesis, transformed into chemical energy of food that consumers can eat. This is the basis of food chains for living organisms. The energy of the sun provides heat and this is also what creates winds and weather patterns on Earth. The Earth's journey around the sun over the course of a year, or its revolution, is why we have seasons, and the rotation of the Earth on its axis is why we have day and night, as we face either toward or away from the sun. It also allows the sea to absorb solar energy to stabilize temperatures on Earth and to allow the ocean conveyor belt to exchange heat between the warmer and colder areas on Earth. Basically, we rely on the energy of the sun to keep the Earth viable.

weddanever | Student

yeah, i support mr. najm1947, if we are not mistaken its the sun you are talking about. so going to you question, most life form are intimately link to the sun for energy, as we know it, the sun is the most viable source of energy in the planet. among all the kingdoms plantae are the most dependent on the energy it gives for their photosynthesis. animals also takes in this energy through eating. thats why there is one way or another interconnection between organism and the sun

najm1947 | Student

I think you mean Sun by the star which is about 150 million km away. The reason is the light and heat coming from the Sun. There cannot be green plants in spite of abundance of water on Earth. Photosynthesis requires light for green plants to grow. These plants become food for the herbivores which in turn become food for carnivores. The food cycle does not get completed without the presence of Sun. This is true for both, the life forms in water and on the land. So that's how most of the life forms on Earth are linked to a star (Sun) 150 million kilometers away.

Sun is the basic source of energy for things to happen on Earth. No Sun, no clouds, no rains, no vegetation, no animals and almost no life.