A bird flies. If it was not semetrical, it would fly crooked. If birds flew crooked, there would be a bunch of birds flying around in circles. Sponges do not fly or even move, so they do not need to be semetrical.
Jay bird
food............ cant u use ur common sense...
well there are all types of birds that can not fly for example the penguin well we all know that
With bilateral symmetry the sensory organs tend to group toward the anterior (front) normally around the head. This means that while you may have more brainpower you may not have the ability to see things behind you or to have the ability to smell by touch. These may not be the coolest abilities but they are interesting and animals with bilateral symmetry don't tend to have them. The sensory organs are not evenly distributed. Also, animals with radial symmetry can reach out on all sides and therefore have a better chance against predators in that sense.
because tendons is what make the wing move
He has gone out of the water before and been fine.
You cant really fix a sponge but maybe with some duct tape.
You Cant
Probably a sponge.
no we cant make
Jay bird
You cant
you cant
a bird that cant fly
depends on the density of the liquid
you cant
it cant breath