An artificial pacemaker is a device that replaces the actions of the
A) atrioventricular node. B) ventricles.
C) atria. D) sinoatrial node.
D
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Given large differences in moisture retention in soils, what would you predict?
A) decreased community diversity B) no effect on community diversity C) increased community diversity D) more similar functional types in the community
Immediately after putting on a shirt, your skin might feel itchy. However, this perception soon fades due to _____
A) sensory adaptation B) accommodation C) reduced motor unit recruitment D) reduced receptor amplification
Glycosylated proteins and lipids within the plasma membrane are important for
A. cell recognition. B. cell protection. C. cell energy storage. D. cell recognition and protection. E. cell protection and energy storage.
A compound that could not have been present in the early atmosphere, because it is quite reactive and
would have broken down organic molecules that were a necessary step in the origin of life on Earth, is: a. oxygen. b. sulfur dioxide. c. hydrogen sulfide. d. carbon dioxide. e. sodium chloride.