If You Looked at the Mouthparts of a Grasshopper,a Butterfly,and

question 9

Multiple Choice

If you looked at the mouthparts of a grasshopper,a butterfly,and a mosquito,you would see that they are very different.Grasshopper mouthparts are adapted for cutting and grinding up tough plant food;butterflies have a single,long,curled sucking tube for drinking nectar;and mosquitoes have both a sucking tube and needlelike structures for piercing skin.In spite of their differences,though,all three insects (indeed,all 900,000 species of insects!) have mouthparts composed of the same anatomical structures in the same positions.These facts tell you that

• A) insect mouthparts are homologous and demonstrate that all insects inherited the same basic anatomical structures from a single common ancestor.
• B) insect mouthparts are vestigial structures inherited from a common ancestor in which they were useful.
• C) insect mouthparts are developmental homologies that demonstrate common ancestry for all insects.
• D) DNA sequence homology among insects is very strong.
• E) insects are unrelated;their mouthparts represent adaptations to their different ecological requirements.

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