Whales have horizontally positioned tales opposed to fish and they swim in an up and down type of motion to move, where as fish are the exact opposite flexing and turning their body left and right with their vertical tale to move.
Whales have bigger mouths to eat large schools of krill (their main source of food)
And also, whales are mammals, and breathe with their lungs, whereas fish use gills to breathe underwater. I hope this helped! Please mark Brainliest!
Explanation:
The best-known neurotransmitters responsible for such fast, but short-lived excitatory action are acetylcholine, norepinephrine, and epinephrine while GABA is the major inhibitory neurotransmitter. Neurons are the basic building blocks of the nervous system.
I'm assuming you meant and frailness not fertility, in which case it is the oldest old period
