Membranes with unsaturated fatty acids in their components are more flexible and fluid because: a. unsaturated fatty acids pack closely together to form ordered arrays. b. unsaturated fatty acids bend at the double bond preventing close packing. c. saturated fatty acids have a "kink" that produces more fluid aggregates. d. unsaturated fatty acids have cis double bonds that prevent formation of the "kink." e. all of the above are correct.

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the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands