What form of cladogenesis occurs due to geographic separation of a population?
A. Parapatric speciation
B. Allopatric speciation
C. Sympatric speciation
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Viruses that are polyhedrons with 20 sides are said to have ________ symmetry.
Fill in the blank(s) with the appropriate word(s).
Which pair of hormones regulates the calcium levels of the blood?
a. thyroxin and parathyroid hormone b. adrenocorticotropic hormone and thyroid stimulating hormone c. prolactin and oxytocin d. parathyroid hormone and calcitonin e. calcitonin and thyroxin
Louis Pasteur demonstrated that fermentation of sugar to produce alcohol is caused by
A. aerobes. B. facultative anaerobes. C. obligate parasites. D. archaea. E. prokaryotes.
Stored energy is known as
A. knetic energy B. Potential energy C. magnetic energy D. themal energy