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SUN : Nothing is more important to us on Earth than the Sun. Without the Sun's heat and light, the Earth would be a lifeless ball of ice-coated rock. The Sun warms our seas, stirs our atmosphere, generates our weather patterns, and gives energy to the growing green plants that provide the food and oxygen for life on Earth.
We know the Sun through its heat and light, but other, less obvious aspects of the Sun affect Earth and society. Energetic atomic particles and X-rays from solar flares and other disturbances on the Sun often affect radio waves traveling the Earth's ionosphere, causing interference and even blackouts of long-distance radio communications. Disturbances of the Earth's magnetic field by solar phenomena sometimes induce huge voltage fluctuations in power lines, threatening to black out cities. Even such seemingly unrelated activities as the flight of homing pigeons, transatlantic cable traffic, and the control of oil flow in the Alaska pipeline apparently are interfered with by magnetic disturbances caused by events on the Sun. Thus, understanding these changes - and the solar events that cause them - is important for scientific, social, and economic reasons.
We have long recognized the importance of the Sun and watched it closely. Primitive people worshiped the Sun and were afraid when it would disappear during an eclipse. Since the early seventeenth century, scientists have studied it with telescopes, analyzing the light and heat that manage to penetrate our absorbing, turbulent atmosphere. Finally, we have launched solar instruments and ourselves-into space, to view the Sun and its awesome eruptions in their every aspect.
Once, when we looked at the Sun by the visible light that reaches the ground, it seemed an average, rather stable star. It was not exactly constant, but it seemed to vary in a fairly regular fashion, with a cycle of sun spots that comes and goes in about eleven years.
Explanation:
PLANTS : Plants are really important for the planet and for all living things.
Plants absorb carbon dioxide and release oxygen from their leaves, which humans and other animals need to breathe.
Living things need plants to live - they eat them and live in them.
Plants help to clean water too.
ANIMALS : Animals are our companions, our workers, our eyes and ears, and our food. They appear in ancient cave paintings, and on modern commercial farms. We have domesticated some of them, while others remain wild and are sometimes endangered by our activities. They keep us company, and while they can provide comic relief, they also serve us as valuable assistants.The huge diversity of work performed by animals ranges from transportation to hunting to assisting the blind. Even in the automotive era, "horsepower" survives as a unit of measurement. Egyptian illustrations from 5,000 years ago show oxen pulling plows, and cattle have historically been used more than horses as draft animals. Service dogs offer their senses of sight, hearing and smell to aid people with disabilities and perform law-enforcement duties. Unlike the performance of specific tasks, an animal's value as a companion might be more difficult to measure.