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nightblade354
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Expert reply
10 Sep 2020, 06:00
Kudos
Bookmarks
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
64% (02:23) correct
36%
(02:33)
wrong
based on 795
sessions
History
Date
Time
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Not Attempted Yet
Until about 400 million years ago. fishes-the first true swimmers-were jawless. Their feeding methods were limited to either sucking in surface plankton or sucking in food particles from bottom mud. With the development of biting jaws. however, the life of fishes changed dramatically, since jaws allowed them actively to pursue prey, to seize it in their jaws, and to manipulate it between their teeth. The jawed fishes then developed along two main lines one retained cartilage for its skeletons, for example, sharks and rays: the other adopted bone as its principal skeletal material. From the latter group evolved the most abundant and diverse of all of today s vertebrate groups. the "teleosts," some 21,000 species, which vary from barracudas to sea horses
If all of the statements in the passage are true which one of the following must also the true?
(A) Fish are the primary prey of all jawed fishes
(B) The jawless fishes did not prey upon other fish
(C) Teleosts do not feed upon particles found in bottom mud
(D) Jawless fishes did not have cartilage as their skeletal material
(E) Jawless fishes became extinct approximately 400 million years ago
If all of the statements in the passage are true which one of the following must also the true?
(A) Fish are the primary prey of all jawed fishes
(B) The jawless fishes did not prey upon other fish
(C) Teleosts do not feed upon particles found in bottom mud
(D) Jawless fishes did not have cartilage as their skeletal material
(E) Jawless fishes became extinct approximately 400 million years ago
10 Sep 2020, 08:22
Kudos
Bookmarks
B is the answer, since the passage states that jawless fishes feeding methods were limited to either sucking in surface plankton or sucking in food particles from bottom mud.
A may not be true as while jawed fish can eat fish, the passage does not imply that fishes are their primary prey.
C may not be true as the passage does not imply this.
D is false as the passage states that some jawed fishes retained cartilage for its skeletons. This implies that jawed fishes had cartilage before then.
E may not be true since the passage merely implies that jawed fish first appeared about 400 million years ago. It does not suggest all jawless fishes became jawed fishes.
Until about 400 million years ago. fishes-the first true swimmers-were jawless. Their feeding methods were limited to either sucking in surface plankton or sucking in food particles from bottom mud. With the development of biting jaws. however, the life of fishes changed dramatically, since jaws allowed them actively to pursue prey, to seize it in their jaws, and to manipulate it between their teeth. The jawed fishes then developed along two main lines one retained cartilage for its skeletons. for its skeletons, for example, sharks and rays: the other adopted bone as its principal skeletal material. From the latter group evolved the most abundant and diverse of all of today s vertebrate groups. the "teleosts," some 21,000 species, which vary from barracudas to sea horses
If all of the statements in the passage are true which one of the following must also the true?
(A) Fish are the primary prey of all jawed fishes
(B) The jawless fishes did not prey upon other fish
(C) Teleosts do not feed upon particles found in bottom mud
(D) Jawless fishes did not have cartilage as their skeletal material
(E) Jawless fishes became extinct approximately 400 million years ago
A may not be true as while jawed fish can eat fish, the passage does not imply that fishes are their primary prey.
C may not be true as the passage does not imply this.
D is false as the passage states that some jawed fishes retained cartilage for its skeletons. This implies that jawed fishes had cartilage before then.
E may not be true since the passage merely implies that jawed fish first appeared about 400 million years ago. It does not suggest all jawless fishes became jawed fishes.
Until about 400 million years ago. fishes-the first true swimmers-were jawless. Their feeding methods were limited to either sucking in surface plankton or sucking in food particles from bottom mud. With the development of biting jaws. however, the life of fishes changed dramatically, since jaws allowed them actively to pursue prey, to seize it in their jaws, and to manipulate it between their teeth. The jawed fishes then developed along two main lines one retained cartilage for its skeletons. for its skeletons, for example, sharks and rays: the other adopted bone as its principal skeletal material. From the latter group evolved the most abundant and diverse of all of today s vertebrate groups. the "teleosts," some 21,000 species, which vary from barracudas to sea horses
If all of the statements in the passage are true which one of the following must also the true?
(A) Fish are the primary prey of all jawed fishes
(B) The jawless fishes did not prey upon other fish
(C) Teleosts do not feed upon particles found in bottom mud
(D) Jawless fishes did not have cartilage as their skeletal material
(E) Jawless fishes became extinct approximately 400 million years ago
13 Sep 2020, 23:53
Kudos
Bookmarks
This question is tough one and I can't think of the right answer until the 6th minute.
In my opinion, the correct choice of B is tough to deduce since the stimulus provides that the jawless fishes are suckers and we don't know whether fishes can be preyed by being sucked. I only take a guess at B since only plankton and food particles are mentioned in the context of 'sucking' fishes.
In my opinion, the correct choice of B is tough to deduce since the stimulus provides that the jawless fishes are suckers and we don't know whether fishes can be preyed by being sucked. I only take a guess at B since only plankton and food particles are mentioned in the context of 'sucking' fishes.
