The pacemaker is located in the atrioventricular node. Indicate whether the statement is true or false
False - sinoatrial
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Global warming has led to less snow cover in some areas. Snow cover provides insulation for
some burrowing, hibernating animals. In a population of rodents, some animals have slightly thicker fur, and animals with this trait are more likely to survive the winters with low snow cover and thus produce offspring in the spring. This scenario is an example of
a. an adaptation. b. evolution. c. natural selection. d. homology.
Tay—Sachs disease is most prevalent among populations of the Pennsylvania Amish in the United States
Indicate whether the statement is true or false
What observation does the Red Queen Hypothesis seek to provide an explanation for?
A. Rate of extinction of taxa is fairly constant over time. B. Rates of extinction vary substantially between different groups of organisms. C. Lineages become more resistant to extinction the longer they have been present. D. Rates of extinction vary substantially between different groups of organisms, and lineages become more resistant to extinction the longer they have been present. E. Immediately after speciation, risk of extinction is very high, but it eventually levels out.
Darwin proposed that natural selection occurs in an environment by
A. favoring those individuals with the most favorable acquired characteristics. B. resisting the environment and keeping the environment from changing. C. producing a constant number of offspring while in that environment. D. surviving for a fixed amount of time. E. favoring heritable features that make the organism better suited to survive and reproduce.