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Which of the following is correctly matched?
Option: 1
Agnatha - Jawless vertebrates
Option: 2
Gnathostomata - Vertebrates with jaw
Option: 3
. Both of these
Option: 4
None of these
Answers (1)
Phylum Vertebrata - Characteristics Features -
Phylum Vertebrata - Characteristics Features:
- They are also called higher chordates.
- The notochord is present only during the embryonic stage. It is replaced by the vertebral column or spine.
- They possess a well developed central nervous system with a brain and spinal cord.
- They possess a well-differentiated head. The brain is surrounded by cranium or skull.
- They have a closed circulatory system with two, three, or four chambered heart.
- They have well developed respiratory, digestive, muscular and endocrine system.
- The phylum Vertebrata is divided into two divisions as follows:
- Agnatha : They lack true jaws and paired appendages. They have only one important class ? Cyclostomata
- Gnathostomata : They possess true jaws and paired appendages. They have two important superclasses ? Pisces and Tetrapoda
-
Agnatha : They lack true jaws and paired appendages. They have only one important class - Cyclostomata Gnathostomata : They possess true jaws and paired appendages. They have two important superclasses - Pisces and Tetrapoda
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