Which characteristic is unique to vertebrates? A) they all have a well-defined skeleton

B) they have no defined organ systems

C) they have bilateral symmetry

D) they have an exoskeleton
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The large ground finch obtains food by cracking seeds. what is its short, strong beak an example? a) tendency toward perfection b) adaptation of a species over time c) selective use and disuse of an organ over time d) scarcity of recourses

Describe characteristics of a good respitory surface

What will happen if two of the base pairs of the stand of the dna are switched