An element in the second row of the periodic table that has four valence electrons would most likely _____.
A) form four covalent bonds
B) have a full outer shell and be unreactive
C) form ionic bonds
D) be more electronegative than an element with six valence electrons in the same row of the periodic table
A) form four covalent bonds
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________ are cytoplasmic channels through openings in plant cell walls.
Fill in the blank(s) with the appropriate word(s).
An organism's fitness is measured by
A. the number of offspring it has. B. the size of the population of which it is a member. C. how long it lives compared to others in its species. D. All of these answers are true.
Which of the following bacteria that inhabit the mouth is involved in plaque formation?
A. Streptococcus mutans B. Haemophilus spp. C. Streptococcus viridans D. Lactobacillus spp. E. Staphylococcus spp.
Development of new vaccines has slowed in recent decades. This is due to
A. the ineffectiveness of vaccines against disease. B. the availability of vaccines against nearly all serious diseases. C. the high cost of development. D. the high level of risk with immunization. E. a lack of need with modern medical treatments.