Vascular plants exhibit alternation of generation. what is alternation of generation?
a. the plant exhibits reduced sporophyte and dominant gametophyte alternately.
b. plant cells undergo mitosis and meiosis alternately.
c. the plant exists as a diploid organism, and at other times as a haploid.

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the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.