The Hawaiian islands are a great showcase of evolution because of intense
A) ecological isolation and sympatric speciation.
B) adaptive radiation and allopatric speciation.
C) allopolyploidy and sympatric speciation.
D) cross-specific mating and reinforcement.
E) hybrid vigor and allopatric speciation.
Answer: B) adaptive radiation and allopatric speciation.
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The compound magnesium chloride (MgCl2 ) turns into one Mg2+ and two Cl- when placed in water. You can guess that the Mg and Cl atoms are held together normally by a(n) ________ bond
A) covalent B) electronegative C) hydrogen D) ionic
The lungs have increased surface area to increase the movement of oxygen into the circulatory system.
a. true b. false
The entire DNA sequence of a species is called its ________.
Fill in the blank(s) with the appropriate word(s).
The first level of compaction of DNA consists of
A) DNA winding around histones to form small nucleosomes. B) tight coiling of DNA with nucleosomes into higher order structures. C) compaction into metaphase chromosomes. D) histone, DNA, and nonhistone covalent bonding.