Rabbits don't sweat. Rabbits use their ears as a heating and cooling system so to speak. So in the long run, sweating doesn't help a rabbit's body.
The plural form for rabbit ears is (one) rabbit's ears; or (two) rabbits' ears.
True
It's not true that rabbits with long ears have a longer lifespan than rabbits with short ears. Ear length has no bearing on a rabbit's lifespan.
Rabbits vary in color, size, length of ears, and length of body. Some rabbits are small and others are very large and can hop further distances.
It depends on its species and size. Tiny rabbits have tiny ears.
No. Floppy eared rabbits are simply bred that way, just like many other species of pets are bred for a certain look, or body characteristic. Pointy eared rabbits with their ears down are usually simply feeling a bit scared or uncertain.
There are many rabbits with ears sticking up. My Netherland dwarf rabbit, which is the smallest rabbit, has upright ears. Also dutch rabbits and rex rabbits do, to name some. Hope this is of some help :)
All rabbits have long ears...
No. There are breeds who have floppy ears.
Genetics.
Their ears have gotten longer to hear better.