They are sensory organs used for smell and balance.
Do unicorns have horns!? yes they have antennes
Butterflies use their energy in various ways. Butterflies use their energy to eat and to fly around their environments for example.
There were migratory butterflies.
nothing
All butterflies can use flight (escape) as a defense. Some are poisonous. Many use camouflage.
a buch of butterflies flew across my backyard.
They use all the flowers.
to fly
to fly
Actually, butterflies don't eat flowers. Caterpillars do. The butterflies use their proboscis to suck the nectar out of the center of the flower.
I was about to ask her to marry me, and I felt butterflies in my stomach.
Nectar from flowers