Before applying asphalt shingles to a roof, a ____ is installed along the roof edges.
a.rafter
b.drip edge
c.flashing
d.sill
ANS: B
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DNA molecules consist of chemically linked sequences of the bases adenine, guanine, cytosine, and thymine, denoted A, G, C, and T. A sequence of three bases is called a codon. A base may appear more than once in a codon.
a. How many different codons are there? b. The bases A and G are purines, while C and T are pyrimidines. How many codons are there whose first and third bases are purines and whose second base is a pyrimidine? c. How many codons consist of three different bases?
Using a sketch, explain why an air barrier is called an air-weather barrier.
What will be an ideal response?
We are getting more forest products from less forest and no more cut trees than we did in 1900. How is this possible?
What will be an ideal response?
____________________ control the water used in the flushing process
Fill in the blank(s) with the appropriate word(s).