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18 April, 13:21

Which of the following traits is only found in vertebrates?

a. a highly developed nervous system and internal skeleton

b. a major function to obtain food and oxygen for energy

c. multi-cellular bodies

d. internal conditions are kept in balance

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Answers (2)
  1. 18 April, 13:28
    0
    A is the answer, every animal needs the other choices
  2. 18 April, 14:19
    0
    a. a highly developed nervous system and internal skeleton

    Explanation:

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    -Chilly
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