ࡱ> Root Entry 'FileHeader)DocInfoQfBodyText К'К' "#%&'()*+,9;Root Entry0W FileHeader)DocInfoQgBodyText 0W0W -! ./12345678:<= !"#$%&'(-*+,./0123456789:;<=>?@ABCDEFGHJKLMNOPRSTUVWXYZ\]`abcdefgHwpSummaryInformation.IPrvImage 7 PrvTextDocOptions 0W0WSection00Scripts 0W0WJScriptVersion ^DefaultJScript[_LinkDoc_  affect ƥD X Zoologists observe the ways animals interact with one another and their environment. They also try to find out how people and animals affect one another. arise ! disappear, cease to exist, become extinct Most scientists believe that the first life forms were simple, single-celled organisms. More complex animals and plants gradually evolved from these simple organisms. Many groups of invertebrates arose about 650 million years ago. aware ! unaware, imperceptive L ǔ The other two groups of vertebrates - fish and amphibians - have periods of what might be called sleep. During these periods, they become less aware than at other times of what is happening around them. brief ! lengthy, enduring @ Most kinds of reptiles do not have dreaming sleep periods, and most kinds of birds have only very brief ones. All mammals have periods of dreaming sleep and also periods of slow-wave sleep. burrow E t A solitary dweller, the muskrat may live in a burrow in a steep ban!, H*\ȰÇ#JHŋ3jȱǏ CIɓ(S\ɲ˗0cʜI͛8sɳϟ@ JѣH*]ʴ)H BU5jĩNqbZ׮^bUUgF-,ډ'ݸ6uհi֯YY#KLyXRb&8v-Ym⽤IVz紧5:ᵮf}Xvaխq}5ny&:o 3W⹱4>B/׼:o}p?(Ͽ~Gt [}lyE`F(!{Ql pǙZFՆ&z3Uxr!6qj 蚍wkM@$^%"9z:bY n{GYq."S> 0#T ihlpY9]gt2o q磐&U#ufG5hcj݅MFZf{9XoZ"o]^魸T]. uZ"aXf*q"X|Xv\+?+o ܺ&q׫`Ѹn,Khk+e (% Y2XwTjk/V&lnβ\5e*3 gyDMn*+% zi%7dqu9Nt;yo,ܩlGKĂ6)wkםln.nn2p֋T#nW"KڝM+3RMw_;)mMwg%sGf\{Rc託뾾nRuھ&!u>Rۊ n/,ji?TUkY4Ll SҘ9ig 1'5Jm"VG$d80΂ 4 gHpM#ʂWmf:CnH"HEZF5GP۱@H]k$A`G;OĨ,unFL|9XaIRcDGlUr{.5L"CAeh4+æsHd$%[X\(GTodN16Ke"աRTA%&'Nf$ 6RTp ׬4* :Q'kZs4u;)EL~오V̀у<[!Ize‰-N_xMG9̀vőq1-'da+ٗ4J7#A[B\JMaH%jCEoI0jң8Ӕm9yں~z^Má:4{UծznR)x1,#rVS ֺN$>ŠPt6h(uY<9铳XAi)Qz!<ӥ6@dGי$ ub!fWֺlnw n;|p|`a``a`0x , T ` lx 1  2007D 2 7| ”| $ 10:10:18Administrator6, 0, 0, 597 6@~TJ@0W@ !"#$%&'(-*+,./0123456789:;<=>?@ABCDEFGHJKLMNOPRSTUVWXYZ\]`abcdefgHwpSummaryInformation.IPrvImage 7 PrvTextDocOptions ' 'Section0$Scripts ' 'JScriptVersion ^DefaultJScript[_LinkDoc_  affect ƥD X Zoologists observe the ways animals interact with one another and their environment. They also try to find out how people and animals affect one another. arise ! disappear, cease to exist, become extinct Most scientists believe that the first life forms were simple, single-celled organisms. More complex animals and plants gradually evolved from these simple organisms. Many groups of invertebrates arose about 650 million years ago. aware ! unaware, imperceptive L ǔ The other two groups of vertebrates - fish and amphibians - have periods of what might be called sleep. During these periods, they become less aware than at other times of what is happening around them. brief ! lengthy, enduring @ Most kinds of reptiles do not have dreaming sleep periods, and most kinds of birds have only very brief ones. 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