43. Chordata are A. Invertebrates
B. Vertebrates
C. Semi-vertebrates (partial spine)
D. None of the above

B. Vertebrates

chordata are vertebrates

hope it helps you

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation: