Answer:
Weight in my belly, trees on my back, nails in my ribs, feet I do lack. What am I?
I am a pretty one, fluttering in the pale blue sky. Delicate, fragile on the wing, indeed I am a pretty thing. What am I?
What is shaped like a box, has no feet, and runs up and down?
I am the minerals vital for your good health.
I am known for my natural tuxedo and marching. What am I?
They're actually great swimmers now, but later they will become excellent hoppers.