A) progressive species
B) retrogressive species
C) successive species
D) digressive species
Correct Answer: B
Solution :
A species produced by loss or disappearance of a few characters founds in parent is termed as retrogressive species. In an example of urochordates or tunicates, larva possess three distinct Chordata characteristics but during metamorphosis notochord and the major part of nerve cord are disappeared.
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