MCQ
Which one is not a true fossil
- APlacoderm
- ✓Limulus
- CArcheopteryx
- DTherapside
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Column $-I$ Column $-II$
$(a)$ $6-15$ pairs of gill slits $(i)$ Trygon
$(b)$ Heterocercal caudal fin $(ii)$ Cyclostomes
$(c)$ Air Bladder $(iii)$ Chondrichthyes
$(d)$ Poison sting $(iv)$ Osteichthyes