Before there were modern humans on Earth (i.e., before 200,000 years ago), how many species became extinct each year? Assume there have always been exactly 10 million species.
A. 10/year
B. 1/year
C. 100/year
D. 1000/year
Answer: A
Environmental & Atmospheric Sciences
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A) Quartz sandstone B) Graywacke C) Arkose D) Conglomerate
Environmental & Atmospheric Sciences
What type of chemical reaction is involved in the formation of disulfide bonds from thiols?
A) addition B) reduction C) oxidation D) substitution
Environmental & Atmospheric Sciences
Find the nearest neighbor statistic for the following pattern, assuming a study area of 15 by 15 km. Test the null hypothesis that the pattern is random by finding the z statistic.
Environmental & Atmospheric Sciences
During what geological period was the sandstone deposited?
What will be an ideal response?
Environmental & Atmospheric Sciences