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Biology 20 Online
shasha12:

We know that animals can be separated into two big groups: vertebrates and invertebrates. An example of each would be a horse and a horse fly. Even though these animals are very different structurally, they have several things in common. Both animals MUST have a method for ____________ because they are both classified as heterotrophs. A) moving B) using oxygen C) getting food D) reproduction

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