Earth Before Life

Dust and ice around the Sun s automated teller were drawn together by gravitational force to sorting a cold mass which we now call Earth . The light produced by meteorite activity , compaction and radioactivity caused the earth to wither , thereby reorganizing elements of varying density into three layers called core , spread out and crust . Gases such as hydrogen nitrogen , water system vapor , nitrogen , methane and carbon dioxide escaped from earth s gravitational attraction . These gases formed a layer around the earth called atmosphere . All these gases are made of basic units called elements which can be further broken down to atoms . Carbon , Hydrogen , due north Oxygen and another 21 naturally-occurring elements are critical for the reality of life on earth . As the temperature of the earth take down , the water vapor in the atmosphere condensed and came down as rainwater . The hollow surfaces on earth got filled with rain water and thus formed oceansLife on earth was sparked by a random combination of physical and chemical reactions , near four billion years ago . Cells are the mental synthesis blocks for any life form that exists and the kiosk s DNA determines the constitution of the cell . All chemical reactions inside a cell are enabled by proteins called enzymes .

The duplication and mutation of enzymes over some(prenominal) thousand years causes diverse life to evolve into founding . All living beings have an underlying structure which in spite of being complex follows some ly pattern . bread and butter organisms also share certain common features such as the ability to reproduce , grow evolve and respond to the remote stimuli . The interaction of one life form with another or the environment forms the basis for an ecosystem Energy is a critical contribution in any ecosystem that makes life on earth executable . No form of energy can be undone , since energy which is used up in one form is converted to another . HenceReferenceCampbell , N .A , Reece , J .B Simon , E .J (2006 . native Biology with Physiology . Benjamin CummingsPage PAGE 1...If you want to get a full essay, order it on our website: Ordercustompaper.com

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