Two dominant organisms commonly found at mid-water levels of the rocky intertidal zone are ________
A) buckshot barnacles and rockweed
B) fiddler crabs and Littorina
C) goose-necked barnacles and mussels
D) periwinkle snails and kelp
E) sea anemones and hermit crabs
C
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In what region of Sub-Saharan Africa is desertification most severe?
A) the Kalahari B) the Sahel C) the Congo D) the Horn of East Africa E) South Africa
According to the following reaction, which molecule is acting as an acid? H3O+ + HSO4- ? H2O + H2SO4
A) H2SO4 B) H2O C) H3O+ D) HSO4- E) none of the above
Which of the following is true of the receptors for steroid hormones?
A) They are hydrophilic. B) They are proteins. C) both a and b D) neither a nor b
According to your textbook, soil is an interface between Earth's spheres, and all life owes its existence to soil. Explain why soil is considered to be so important
What will be an ideal response?