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
D
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This is formed when an atom loses an electron to another atom.
A. polar covalent bond B. cations and anions that can form ionic bonds C. covalent bond D. hydrogen bond E. nonpolar covalent bond
Divergent evolution
A. is more common than convergent evolution. B. results in organisms that are less alike as time goes on. C. can be seen in a wide variety of habitats. D. All of these statements are true.
The chloroplast is
A. the site of photosynthesis. B. a reproductive structure. C. necessary for diffusion. D. a cause of fermentation.
Which of the following questions can NOT be answered using the scientific method?
A. What was the first living organism on Earth? B. Does a particular gene influence aging in mice? C. How does migration affect the reproductive success of monarch butterflies? D. How does coastal development affect wetland biodiversity?