Darwin and Wallace's theory of evolution by natural selection was revolutionary because it _____
A) was the first theory to refute the ideas of special creation
B) proved that individuals acclimated to their environment over time
C) dismissed the idea that species are constant and emphasized the importance of variation and change in populations
D) was the first time a biologist had proposed that species changed through time
Answer: C
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One way to kill a tree is to girdle it by cutting a groove a centimeter into the bark all around the trunk of the tree. The tree will typically survive that growing season, but will die over the winter. Which of the following is the best explanation for this observation?
A. The phloem was cut, so water and nutrients cannot be taken up to the leaves. B. The xylem was cut, so sugars cannot be transported to the roots. C. The phloem was cut, so sugars cannot be transported to the roots. D. The xylem was cut, so water and nutrients cannot be taken up to the leaves. E. The xylem was cut, which gives access to pathogens that kill the tree.
When a sarcomere is at rest, the myosin binding sites
on actin are blocked by a. calcium. b. troponin. c. tropomyosin. d. the myosin heads. e. ADP.
In general, one could say that there are fewer levels of regulation possible in prokaryotes than in eukaryotes
Indicate whether the statement is true or false
The twining of tendrils around a support is an example of thigmomorphogenesis
____________________ Indicate whether the statement is true or false.