Answer: The blue whale is the heaviest animal ever known to have existed.
...
Heaviest living animals.
Rank 1
Animal Blue whale
Average mass [tonnes] 110
Maximum mass [tonnes] 190
Average total length [m (ft)] 24 (79)
HOPE THIS HELPS
Your answer !flow directly from the atrium into the ventricle
What they mean by "base" is the substance. A base is a substance that tastes bitter, has a pH that is greater than 7. It also turns red litmus paper blue.
In conclusion, what they mean by 'base' is the substance included.