Question

which level of biological classification is the lowest level that butterflies (invertebrates) and dogs (vertebrates) have in common?
domain
kingdom
species
family

Explanation:

Biological classification hierarchy (from broadest to narrowest) is Domain > Kingdom > Phylum > Class > Order > Family > Genus > Species. Butterflies (invertebrates) and dogs (vertebrates) both belong to the Domain Eukarya, but they share the Kingdom Animalia as a more specific (lower) common level. Species and family are far too narrow, as butterflies and dogs are vastly different organisms with no overlap at those levels.

Answer:

B. kingdom