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?
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