1  2  3  4

1  _  _  _  _

2  _  _  _  _

3  _  _  _  _

4  _  _  _  _


ACROSS
1)  travel through water
2)  a caustic substance produced by heating ____stone
3)  a european river; flows into the baltic sea
4)  (____tics) a segment of dna that is involved in producing a polypeptide chain; it can include regions preceding and following the coding dna as well as introns between the exons; it is considered a unit of heredity


DOWN
1)  work doggedly or persistently
2)  having great (or a certain) extent from one side to the other
3)  a primeval egyptian personification of air and breath; worshipped especially at thebes
4)  a small pond of standing water

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