It carries signals for the body through nerves (answer 3)
I think it’s a galaxy im sorry if I’m wrong !!
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Answer:
a. By Calculating magnetic reversals.
Explanation:
They determine the age of the ocean floor by examining magnetic fields in the planet Earth.
Living things are based on a universal genetic code. All organisms store the complex information they need to live, grow, and reproduce in a genetic code written in a molecule called DNA. That information is copied and passed from parent to offspring and is ALMOST identical in every organism on Earth.