PUNEETSCHDV wrote:
I have doubts with first and third questions
For 1st I marked E and for 3rd I marked C
Q.11. Which of the following statements finds the LEAST
support in the passage?
A. Population divergences resulting from the formation of the
Pan-American isthmus were more a process than an
event.
B. The divergence in ocean temperature during the formation
of the Pan-American isthmus resulted in a divergence in
the ocean’s nutrient value.
C. Genetic differences among pistol shrimp have grown to the
point that there are now at least two distinct species of
these shrimp.
D. The part of ocean which is now the Pacific grew deeper
due to the geologic forces that created the Pan-American
isthmus.
here is support for D As the seabed rose, Pacific
waters grew cooler, their up-swelling currents carrying rich
nutrients, while the Atlantic side grew shallower, warmer, and
nutrient poor.
Atlantic grew shallower and pacific grew deeper
E. Not until the Pan-American isthmus was fully formed did
geminate marine organisms begin to develop in that area
of the ocean.
and opposite for E
Yet the two oceans had
already begun to form their distinctive personalities long before
the isthmus was fully formed.
So Geminate Organishms begin developing before isthmus was formed by process explained after this line .
for Q.3 . The author mentions the mating habits of pistol shrimp
in order to show that
A. Some species of marine organism inhabiting the Pacific Ocean
are now entirely distinct from those in the Atlantic Ocean.
B. Twin species of marine organisms can each survive even though
one species can no longer mate with the other.
C. Since the formation of the Pan-American isthmus, some marine
germinates no longer mate with their sister species.
D. Germinate species that do not mate with one another are
considered separate species.
E. The evolutionary impact of the Pan-American isthmus was
greater for marine organisms than for land animals.
The isthmus cleaved populations of
marine organisms, creating sister species. These twin species,
called “geminates,” then evolved independently.
The 2 species are not entirely different they are sister species , almost similar but do not mate.
C is what the authors intends to show.
For the first question, the option E has support in the passage. Please refer to the below sentences from the Paragraph 1.
The isthmus cleaved populations of
marine organisms, creating sister species. These twin species,
called “geminates,” then evolved independently.
Option E is specific to 'geminates', and from the above sentences 'geminates' evolved only after the formation of the isthmus.
For the third question, please read the below sentences from Paragraph 1.
These twin species,
called “geminates,” then evolved independently. Scientists
observe, for example, that Pacific pistol shrimp no longer mate
with those from the Atlantic Ocean.
Mating of Pistol shrimp is mentioned as an example in the passage. What is this example for? This is an example for the aforementioned behavior that twin species evolved independently (without mating).
Option C is true, but it is not the point why the author mentions mating of the pistol shrimp