This is because butterfly caterpillars are host specific. Plant-wise, the caterpillars of some butterfly species like asters, black-eyed Susan, clover, lupines, milkweed, sedum or violets. Aspen, birch, cherry, hackberry, oak or willow trees make caterpillars of other butterfly species equally happy.
each Br-F bond would be polar or BF4-, there is an extra electron making this a polar molecule. PCl5 has the Cl atoms that must be as far apart from each other as possible and therefore would create equal but opposite pulls.ach Br-F bond would be polar or BF4-, there is an extra electron making this a polar molecule. PCl5 has the Cl atoms that must be as far apart from each other as possible and therefore would create equal but opposite pulls.
The Difference between polar and nonpolar molecules as follows. Polar molecules. A molecule in which there is a little division of charge in the chemical bonds, so that one part of the molecule has a small positive charge and the other has negative charge i.e. dipole. H2O is a good example of a polar molecule.he Difference between polar and nonpolar molecules as follows. Polar molecules. A molecule in which there is a little division of charge in the chemical bonds, so that one part of the molecule has a small positive charge and the other has negative charge i.e. dipole. H2O is a good example of a polar molecule.