Nevernevergiveup wrote:
1. It can be inferred from the passage that Darwin
A. believed that reefs became atolls through the sinking of volcanoes.
B. should have expanded his studies of reefs to include those found at atolls
C. theorized that each reef was formed by an entirely different process.
D. is less persuasive on the topic of reef formation in light of recent discoveries
E. was more interested in algae and coral than in other organisms living at reefs
It is given that :
Quote:
Although Darwin's view of the transformation is considered partially correct, some scientists feel that the creation of reef formations has more to do with the rise in sea level that occurred at the end of the last Ice Age than with a gradual submergence of the volcanic islands to which fringing reefs were originally attached,
Here two views of transformation are given of which Darwin's view is the second one.
And it is also given that-
Quote:
However, recent drillings at one atoll have revealed a substantial underlayer of volcanic rock, which suggests that Darwin's explanation may be largely correct
Using these both comments,answer A.
Ans 1:A2. The passage does NOT discuss the relationship betweenQuote:
A. algal photosynthesis and high oxygen content -Scientists also know that, because of algal photosynthesis, the reef environment is oxygen-rich
B. Darwin's views and evidence supplied by recent research -Although Darwin's view of the transformation is considered partially correct, some scientists feel that the creation of reef formations has more to do with the rise in sea level that occurred at the end of the last Ice Age than with a gradual submergence of the volcanic islands to which fringing reefs were originally attached,
C. volcanic rock and the life forms found at reefs -Not discussed
D. sea salt and calcium carbonate-secreting and depositing calcium carbonate, which reacts with sea salt to form a hard limestone underlayer
E. wave action and the renewal of reefs-All of this accounts for the amazing renewability of coral reefs despite the erosion caused by waves.
My annotations in blue.
Ans 2:C