A difference between the innate immune system and the acquired immune system is
A) the innate immune system includes many more different types of receptors than the acquired immune system.
B) the innate immune response is immediate, whereas the acquired immune response is delayed, peaking about 3 to 5 days after exposure.
C) the innate immune system retains a memory for past exposure, with subsequent responses being faster and more aggressive; the acquired immune system does not.
D) each acquired immune system cell responds to a greater number of different pathogens than each innate immune system cell.
B
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Which of the following statements about old-growth forests is true?
A. Old-growth forests have been without disturbance of any kind for at least 100 years. B. Humans do not reside in old-growth forests. C. They include temperate rainforests, tropical rainforests, boreal forests, and deciduous forests. D. The largest remaining areas of old-growth forests are in North America. E. None of the above is true.
During the Paleozoic, the Transcontinental Arch extended north of the Canadian shield. Indicate whether the statement is true or false
Why is iron not abundant in the ocean?
a. It is trapped in the Earth's crust. b. It is held in sediments. c. It is nearly insoluble in oxygenated water. d. It is not very reactive.
Which of the following statements represents the global climate throughout much of the Earth's history?
A. It was likely warmer than it is today. B. It was likely about the same temperature as it is today. C. It was likely colder than it is today. D. It was likely more variable than it is today.