How do beavers maintain a landscape?

A) massive defoliation of shrubs
B) feeding on roots of graminoid plants
C) feeding on aspen, willow, and birch trees
D) dispersing seeds of mesquite


C

Biology & Microbiology

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What are characteristics of the pedigrees of families with mitochondrial diseases?

A) All children of affected mothers are usually affected regardless of their sex. B) Only the male children of affected mothers are affected, female children are not affected. C) Only female children of affected mothers are also affected, male children are not affected. D) All children of affected males are usually affected.

Biology & Microbiology

The red line in the figure (the furthest to the right) represents

A) low-toxicity Taricha individuals. B) high-toxicity Taricha individuals. C) highly vulnerable garter snake population. D) highly resistant garter snake population.

Biology & Microbiology

Refer to the accompanying figure. A semilunar valve regulates blood flow into which structures?

a. 1 and 2 b. 1 and 5 c. 1 and 7 d. 2 and 7 e. 7 and 11

Biology & Microbiology

For an atom that is NOT an ion, which of the following must be TRUE?

a. the number of electrons equals the number of protons b. the number of protons equals the number of neutrons c. the number of electrons equals the number of neutrons

Biology & Microbiology