The period of revolution of an object in the Solar System is the time it takes an object to travel around the Sun.
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Answer:
1. The descendants are Blue whales, and Humans
2. Back bone Lungs , radius and ulna (front limb bones), structures for producing milk
Explanation: It points to the descendants of common ancestors to blue whales and humans, If not please tell me more clearly what you meant by descendants.
Parents pass genes to their offspring; the genes program cells to make specific enzymes and other proteins, whose cumulative action produces an individual’s inherited traits.
