The most important physical factor for intertidal communities is ____.?
A) ?lack of light
B) ?high salinity
C) l?ack of nutrients
D) ?the rise and fall of the tides
D
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Water, H2O, and methane, CH4, have about the same mass and differ by only one type of atom. Why is the boiling point of water so much higher than that of methane?
A. The oxygen of a water molecule has two lone pairs of electrons. B. The electronegativity difference between oxygen and hydrogen is greater than the electronegativity difference between carbon and hydrogen. C. The water molecule is less symmetrical than in the methane molecule. D. all of the above
About ________ people cross the border at the San Ysidro, California border each year
A) 100 million B) 50 million C) 25 million D) 10 million E) 5 million
Summertime weather in Northern California often consists of low clouds and fog due to ____
A) southerly prevailing winds B) warm coastal water C) cold coastal water D) katabatic winds
Do you think that national parks and preserves are a sufficient way to protect biodiversity?
a. No. Certain factors, including climate change and disease, still threaten native species that live within preserves. b. Yes, but only when coupled with other measures that protect threatened species, including legislation and active management. c. Yes. But we should continuously seek to expand the boundaries and sizes of these preserves in order to accommodate populations that may shift in response to climate change. d. I don’t care; it really does not affect me.