Hydrogen bonds can form between guanine and __________, and between adenine and __________
a. phosphate; sugar
b. thymine; cytosine
c. cytosine; thymine
d. sugar; phosphate
e. adenine; guanine
C
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Which heart chamber is the most muscular?
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The following figure shows studies in a stream where enclosures were set up either with trout or with no trout. Which statement is a correct interpretation of the graph about trout, invertebrates, and algae? 
A. Trout do not seem to affect the algae production; only the invertebrate populations are affected. B. If trout are present in a system, algae production is low and invertebrate population levels are also low. C. Trout do affect the algae production but not the invertebrate populations. D. If trout are present in a system, algae production is high and invertebrate population levels are also high. E. If trout are present in a system, algae production is high and invertebrate population levels are low.