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What protects the lining of the stomach from acidic gastric juices?

Which of the following is most important in making the typical seed more resistant to adverse conditions than the typical spore? a) a different type of sporopollenin b) an internal reservoir of liquid water c) integument(s) d) ability to be dispersed e) waxy cuticle

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