Life What is it?

Life on Mars Scientists have been contemplating finding and establishing life on Mars Our task: What is life?

Look through pages 6-10 and answer the following If an alien life form is discovered, how can you determine if it is alive? When establishing life on Mars what will need to be considered?

Class Answers If an alien life form is discovered, how can you determine if it is alive?

Characteristics of Life Organism is made of cells Organism is organized Cellstissuesorgansorgan systemsorganism http://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/Bio%20101/Bio%20101%20Lectures/cells/onion_epidermal_cells.jpg http://academic.kellogg.cc.mi.us/herbrandsonc/bio201_McKinley/chapte1.jpg

Characteristics of Life Reproduction – make more of own kind Growth and development – changes throughout life in size and structure http://www.adliterate.com/archives/Cardinal%20feeding%20chicks.jpg http://images.encarta.msn.com/xrefmedia/sharemed/targets/images/pho/001bd/001bd609.jpg http://pubs.caes.uga.edu/caespubs/pubcd/B1252-graphics/B1252-2.jpg

Characteristics of Life Homeostasis – maintain a stable internal environment Adaptation – evolve changes according to the environment www.easternct.edu/.../resous9/cartos9/homeo.gif http://animals.pppst.com/banner_camouflage.gif

Characteristics of Life Respond to stimuli – immediate reaction Use energy – movement, getting food, respiration, transport, growth http://projectebola.typepad.com/photos/goddamn_funny_pictures/ouch.jpg http://www.wxzhengda.com/jianjie/ENGLISH/chanping/PIG-5.jpg

References http://images.google.com/imgres?imgurl=http://www.timemachinetoys.com/survivor/S urvivorLogo.JPG&imgrefurl=http://www.timemachinetoys.com/survivor/survivor0002.ht ml&h=293&w=432&sz=53&hl=en&start=10&usg=__OOJCEw_ZRiuVVjw6sehwmcAWO2Y =&tbnid=PIGT9BYBoUUZMM:&tbnh=85&tbnw=126&prev=/images%3Fq%3Dsurvivor%26 gbv%3D2%26hl%3Den http://images1.fanpop.com/images/image_uploads/Survivor-Vanuatu-survivor- 1108813_1024_768.jpg http://www.windows.ucar.edu/mars/images/mars1.gif http://www.daviddarling.info/images/Mars_panorama.jpg http://www.crystalxp.net/galerie/img/img-3d-animations-alien-song-cross-pro- 376.jpg http://www.zslprints.com/image/Red-bellied-Piranha_479969.jpg