Which of the following is not an aerosol?
A) dust B) pollen C) sea salt D) smoke E) methane
E
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Which event is thought to have been a cause for past mass extinctions?
a. A massive earthquake b. A massive tsunami c. An epidemic d. The collision with an asteroid or comet e. The most prolonged ice age
True or False: Only sedimentary rocks can be assigned to geologic periods because they are the only rocks that contain fossils
Indicate whether this statement is true or false.
Which of the following happens to T cells which, during their maturation, have not met and interacted with MHCs
A) Most of them circulate in the blood. B) They are converted to other types of cells. C) They die of neglect. D) They are held in reserve.
Natural levees are banks of a river that have been built up by flood deposits so that they are higher than the surrounding floodplain
Indicate whether the statement is true or false