Which characteristic do vertebrates have that invertebrates lack? A. Bilateral symmetry
B. Backbone
C. Radial symmetry
D. Exoskeleton

In cellular biology, what is the definition of the word specialized? te o a. carried across the cell membrane by a specific protein a o b. a structure within a eukaryotic cell that performs a specific function o c. adapted to a specific function or condition es essere beste ser bendere s b tele ee o d. containing unique dna ser eeseen les, e nde este ses see ste submit e