4. What are some of the characteristics that vertebrates share? (Choose all that apply) endoskeletons and a backbone
joint appendages
highly developed senses and nervous systems
external protective structures

The answers are

endoskeletons and a backbone

highly developed senses and nervous systems

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you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.