The pace of evolution does not always occur at a constant rate but is periodically interrupted by rapid bursts of speciation; this is known as ________ ________.
What will be an ideal response?
punctuated equilibrium
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Why did the authors choose to look for the rubisco gene in the DNA samples taken from permafrost?
A. It is used in respiration by all plants. B. It is used in photosynthesis by all plants. C. Plant cells do not have a nucleus. D. Plant cells do not have mitochondria. E. It is only present in angiosperms (flowering plants).
Which type of species is most likely to go extinct?
a. underharvested b. endemic c. widely distributed d. generalist e. introduced
Of the two types of glands, the ________ glands secrete their products onto body surfaces or into body cavities or organs via ducts
Fill in the blank(s) with correct word
Given the following components of the cardiac conduction cycle, which one of the following best describes the movement of the stimulus that causes a heart contraction? A. atrioventricular bundle B. sinoatrial node C. atria D
atrioventricular node E. Purkinje fibers F. ventricles A) B, C, D, A, E, F B) B, D, A, C, E, F C) D, A, E, F, B, C D) A, D, E, B, C, F E) B, C, D, F, A, E