Not at all. Plenty of amputees out in the world whom were successful.
because they need warmth to survive and fat on their legs keeps their legs warm
If its environment merited them to need short legs or short legs made them survive longer, then a species would evolve short legs.
no
FFS not all living things need legs!
They need both air and water
They both need oxygen to survive.
No. They can survive on land for short periods, but they do not have legs.
they survive by
no
BY Using Their Legs
yes they both need energy to survive because they are eukaryotes
Both need air ,water and food to survive.