Question

Match the columns and choose the correct option from the following.

A. Absence of bone marrow	1. Myxine and Petromyzon
B. Origin of chordates vertebral column	2. Neural cavity
C. Link between chordates and non chordates	3. Balanoglossus
D. Jawless	4. Aves
	5. Fish
	6. Notochord

• A. A - 4, B - 6, C - 3, D - 1
• B. A - 6, B - 3, C - 4, D - 1
• C. A - 2, B - 1, C - 4, D - 6
• D. A - 4, B - 5, C - 3, D - 2

Answer 1

The correct option is A A - 4, B - 6, C - 3, D - 1

A bird's bone is mostly hollow with no marrow.
The notochord is the flexible rod-shaped body found in embryos of all chordates, which is replaced by the vertebral column in the adult.
Balanoglossus or hemichordates are an evolutionary link between vertebrates and invertebrates.
Myxine is a hagfish, while Petromyzon is a parasitic lamprey and both of them are jawless.

So, the correct answer is option A.