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CLASSIFICATION SYSTEMS. CH 2.3 LIFE OVER TIME. Why do we need a system to classify living organisms?. New Species.
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CLASSIFICATION SYSTEMS CH 2.3 LIFE OVER TIME
New Species Match-tip tiny, Brookesiamicra (juvenile pictured) is the smallest of four new chameleon species found on the African island country of Madagascar. With an average adult length of just over an inch (2.9 centimeters) from snout to tail, B. micra is among the tiniest reptiles in the world.
Domains Classify organisms by their cellular structure
THREE DOMAINS BACTERIA Smaller than Eukarya cells and have no nucleus ARCHAEA Have distinctive chemistry and can survive extreme environments
THREE DOMAINS Eukarya Larger and contain more complex structures
PLANTAE • 250,000 species of plants • Multicellular • Eukaryotes • Autotrophs • Cell walls • Cannot move from place to place
ANIMALIA • One million species • 90% are insects • Multicellular • Eukaryotic • No cell walls • Have mouths/nervous system • Heterotrophs • Can more around at least part of their life
PROTISTA • Wide variety of organisms • Most unicellular • Large complex cells with little specialization • Eukaryotes/autotrophs • Most live in water • Most are microscopic • Some are large like seaweed
FUNGI • Three categories • Mushrooms • Molds • Yeasts • Take nutrients from surroundings • Decomposers • Cell walls • Remain rooted in one place
ARCHAEA • Do not have nuclei • Larger than bacteria • More organization than bacteria • Live in many environmentsespecially oceans • Live in extreme environments
BACTERIA • Live everywhere • Unicellular • Small simple cells • No nuclei • Cell wall • Reproduce through binary fission