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Science – lesson #5 what group of organisms is the most numerous ?

Science – lesson #5 what group of organisms is the most numerous ? . Outcomes ( 205-7) and (300-18). What is an a rthropod ?. http://evolution.berkeley.edu/evolibrary/article/_0/arthropods_01 What are characteristics common to arthropods ? . Vocabulary to know.

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Science – lesson #5 what group of organisms is the most numerous ?

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  1. Science – lesson #5 what group of organisms is the most numerous ? Outcomes ( 205-7) and (300-18)

  2. What is an arthropod ? • http://evolution.berkeley.edu/evolibrary/article/_0/arthropods_01 • What are characteristics common to arthropods ?

  3. Vocabulary to know • Arthropod: an animal that has an exoskeleton and three or more pairs of jointed legs • Exoskeleton: a hard outside covering of an animal that has no skeleton inside its body • Identification key: a set of questions, descriptions, and/or pictures that guide you through a process of identifying an organism.

  4. Who are they ? • Arthropod means “jointed foot” • They have a hard external skeleton covering the whole body ( including legs) • And a segmented body • Arthropods might be lobsters, centipedes spiders and insects

  5. adaptations • One of the reasons there are so many of them is the adaptations to their environments. • They live almost anywhere • Exoskeletons protect them from enemies and prevent moisture loss ( they shed their exoskeletons and grow new ones)

  6. How to sort them out (classify) • Since there are so many kinds of arthropods scientist use an identification key to sort them out. • If you compare descriptions with the organism you are observing you refine your search and narrow down to a single species or class. • Turn to page 18 in the student book , read the opening paragraph and then the questions in the exploration.

  7. Questions for identification key • How many legs ? • What are their bodies like ? • How many body sections do they have ? • Do they have eyes ? How many ? • Do they have antennae ? How many ? • What other structure do they have ?

  8. Hard exoskeleton ? With without Worm • Butterfly • Bee • Dragon fly • Scorpion • Centipede • Snail • Grasshopper • Crab • Ant • spider

  9. Number of legs ? 3 pair or more Less than 3

  10. # of body sections ? Three or more Less than 3

  11. Eyes ? Antennae? Two or more none

  12. In your groups… • Use the arthropod samples and pictures provided for your group. • Make up charts using the identification key ( the questions) to classify your samples. • Each person hands in his/her own chart/table

  13. Done ? Try these • http://evolution.berkeley.edu/evolibrary/article/arthropodstory • http://www.biologyjunction.com/arthropods.htm • http://www.bbc.co.uk/schools/gcsebitesize/science/ocr_gateway/understanding_environment/classificationrev3.shtml • No net book ? Look on page 20 and classify those creatures.

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