A spider and an insect are both arthropods, but they have some different characteristics. Choose the descriptions that are true for BOTH a spider and an insect. Check all that apply.  

_____  They have a head, a thorax, and an abdomen.
_____  They have an open circulatory system.
_____  Some species are carnivorous and some are herbivorous.
_____  They have a chitinous exoskeleton.
_____  They have spinnerets.
_____  They molt.
_____  They are members of Ecdysozoa.
_____  They have sensory antennae.
_____  They have metamorphosis.

Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?
 
Gather Content
· What do you already know about arthropods?
 
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
 
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?


_____  They have a head, a thorax, and an abdomen.
__X__  They have an open circulatory system.
_____  Some species are carnivorous and some are herbivorous.
__X__  They have a chitinous exoskeleton.
_____  They have spinnerets.
__X__  They molt.
__X__  They are members of Ecdysozoa.
_____  They have sensory antennae.
_____  They have metamorphosis.

Clarify Question
· What is the key concept addressed by the question?
        o This question addresses arthropods.
· What type of thinking is required?
        o This question is asking you to take what you already know and apply it to this unfamiliar situation.
 
Gather Content
· What do you already know about arthropods?
        o Spiders are chelicerates and insects are hexapods. They are both arthropods, and both members of Ecdysozoa.
        o Spiders have two major body sections, while insects have three.
        o All arthropods have a chitinous exoskeleton, and they grow discontinuously at each molt.
        o Arthropods have an open circulatory system.
 
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
        o Of the listed options, only these are true for both spiders and insects:
        o They have an open circulatory system.
        o They have a chitinous exoskeleton.
        o They molt.
        o They are members of Ecdysozoa.
 
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
        o The question required you to take what you already know and apply it to this unfamiliar situation.
        o Did you recognize that the arthropods all have a chitinous exoskeleton that is molted, and an open circulatory system?
        o Did you remember that the arthropod phylum is part of the larger group Ecdysozoa?

Biology & Microbiology

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