Question

write an essay on the topic Time for Earth
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Answer 1

Answer:

I hope that it will help you

Answer 2

Life People have been looking towards the sky for as long as they have been on the Earth. It seems only natural that civilizations would begin to wonder if life on Earth is the only life in the universe. Understanding what makes life on Earth is the first step to examining the possibility of life elsewhere.
What is Life? Trying to define life is difficult. There is no clear-cut, basic definition of what life is. It is easier to identify the properties of life and decide whether or not something falls into the life or nonlife category based on if it includes these properties. The six properties of life are order, reproduction, growth and development, energy utilization, homeostasis, and evolutionary adaptation. This process results in the more advantageous traits being passed on through the generations as the less valuable traits are lost.
Life on Earth Life on Earth is dependent on three factors: a source of nutrients, a source of energy, and liquid water (Bennett, 2012, p. 510). If one of these three requirements was not present on Earth, life could not continue. Nutrients, atoms and molecules, are the necessities for building living cells (Bennett, 2012, p. 510). Energy can come from many sources including the Sun, chemical reactions, and the natural heat from the Earth (Bennett, 2012, p. 510). This energy is the fuel for all life. Liquid water, something found in abundance on Earth, is the last needed factor.
History of Life on Earth Life on Earth has existed for a relatively long time when compared to the age of the Earth. Life likely first began about 3.8 billion years ago, less than a billion years after the Earth was formed. The first life was single-cell prokaryotic life, like bacteria (History of life on Earth, 2014). Modern-day organisms found at the bottom of the ocean floor, surrounding volcanic vents, appear to be some of the evolutionary oldest organisms on Earth (Bennett, 2012).