[Answer] 8. 50 to 70 percent of a whale's body weight is:

Step 1 : Introduction to the question "8. 50 to 70 percent of a whale's body weight is:"

...1. lungs 2. blubber 3. heart 4. stomach Blubber helps whales keep warm in the depths of the ocean. Right whales and Bowhead whales have sometimes 30 centimeters of blubber on parts of their bodies. It has more blood vessels than normal fatty tissue and is attached to the whale's skeleton by ligaments and tendons.

Step 2 : Answer to the question "8. 50 to 70 percent of a whale's body weight is:"

blubber:

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