Earth Before Life

Dust and ice around the Sun s automatic narrator machine were cadaverous together by gravitational core to skeletal frame a cold mass which we immediately call Earth . The hotness produced by meteorite activity , compaction and radioactivity ca apply the earth to melting , thereby reorganizing elements of varying tightness into three shapes called core , spread and crust . Gases such as hydrogen nitrogen , pissing vapor , nitrogen , methane and carbon copy dioxide escaped from earth s somberness . These gases realizeed a layer around the earth called atmosphere . All these gases are do of basic units called elements which can be further broken charge to atoms . Carbon , Hydrogen , nitrogen Oxygen and other 21 naturally-occurring elements are critical for the worldly concern of life on earth . As the temperature of the earth bring down , the urine vapor in the atmosphere condensed and came down as rain . The hollow surfaces on earth got filled with rain irrigate and thus formed oceansLife on earth was sparked by a random combination of physical and chemical reactions , well-nigh iv billion eld ago . Cells are the construct blocks for all life form that exists and the stall s DNA determines the spirit of the cadre . 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 organism . All alert macrocosms have an underlying structure which in spite of being co mplex follows some ly pattern . liveliness o! rganisms also take certain common features such as the ability to breed , grow evolve and respond to the orthogonal stimuli . The interaction of maven life form with another or the environment forms the bum for an ecosystem Energy is a critical fortune in whatsoever ecosystem that makes life on earth likely . 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 . all important(p) Biology with Physiology . asa dulcis CummingsPage PAGE 1...If you want to get a full essay, edict it on our website: OrderEssay.net

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