Dichotomous keys can have different formats. The
branching one on the top is
sometimes called a "spider
key." Both of these keys on the
left have four steps. Try using
both keys and compare which
you prefer.
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Contrast how pollination is different among gymnosperms and angiosperms.

Recombinant dna is the merging of dna from unrelated organisms to create new genetic varieties is assembled in the lab from mononucleotides was part of the green revolution of the 1960s is pollination of one plant by another of the same species is cross-pollination of one plant by a different species

Are the layers of rock above and below the coal older or younger?