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ladaveneahanna
ladaveneahanna ladaveneahanna
  • 06-04-2016
  • Biology
Answered

Fish are classified as vertebrates because they have

Aa brain.
Ba backbone.
Ctwo germ layers.
Dbilateral symmetry.

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WhatEverIDontCare
WhatEverIDontCare WhatEverIDontCare
  • 06-04-2016

B, a backbone.

Not A, because we know some species that aren't vertebrates and have a brain. 
C. two germ layers, isn't a characteristic specific to vertebrates.
d. bilateral symmetry, no for the same reasons as A.

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rvarela1
rvarela1 rvarela1
  • 06-04-2016

the answer is b) a backbone

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