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Uva@90
- Master | Next Rank: 500 Posts
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- Joined: Thu Jul 04, 2013 7:30 am
- Location: Chennai, India
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Hi All,
Boa constrictors have tiny hind leg bones buried in muscles toward their tail ends. These vestigial legs are a clue that snakes descendants from lizards over 100 million years ago and walked the earth on their hind legs. A recently discovered fossil of boa constrictor has very fragile hind legs with half formed hind leg bones that could not have supported the animal's weight on land
Which of the following statement, if also true, would most strongly support the conclusion that the fragile hind leg bones are remnants of legs that boa constrictor once had?
A)No other snakes comparable to boa constrictor in size and weight have remnants of hind leg bones
B)No fossil of ancient boa constrictor with intact hind legs capable of supporting the animal's weight have ever been discovered.
C)It has not yet been conclusively proved that these vestigial legs of boas are non-functional.
D)Older boa constrictor fossils confirmed that ancient boas had full hind leg bones.
E)Animals with hind legs would typically also have pelvises and these would be evident in their fossils.
OA: D
Source: CracktheVerbal CR Book.
There is no explanation given. I am not able to get OA.
Could you pls explain me.
Thanks in advance.
Regards,
Uva.
Boa constrictors have tiny hind leg bones buried in muscles toward their tail ends. These vestigial legs are a clue that snakes descendants from lizards over 100 million years ago and walked the earth on their hind legs. A recently discovered fossil of boa constrictor has very fragile hind legs with half formed hind leg bones that could not have supported the animal's weight on land
Which of the following statement, if also true, would most strongly support the conclusion that the fragile hind leg bones are remnants of legs that boa constrictor once had?
A)No other snakes comparable to boa constrictor in size and weight have remnants of hind leg bones
B)No fossil of ancient boa constrictor with intact hind legs capable of supporting the animal's weight have ever been discovered.
C)It has not yet been conclusively proved that these vestigial legs of boas are non-functional.
D)Older boa constrictor fossils confirmed that ancient boas had full hind leg bones.
E)Animals with hind legs would typically also have pelvises and these would be evident in their fossils.
OA: D
Source: CracktheVerbal CR Book.
There is no explanation given. I am not able to get OA.
Could you pls explain me.
Thanks in advance.
Regards,
Uva.
Known is a drop Unknown is an Ocean
