MCQ
How old is our universe?
- A$10$ billion year old
- ✓$20$ billion year old
- C$15$ billion year old
- D$5$ billion year old
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$R$ : Echinoderms have secondarily adapted to radial symmetry.
$(a)$ $'H'$ zone disappears
$(b)$ $'A'$ band widens
$(c)$ $'I'$ band reduces in width
$(d)$ Myosine hydrolyzes $ATP,$ releasing the $ADP$ and $\mathrm{Pi}$
$(e)$ $Z-$lines attached to actins are pulled inwards Choose the correct answer from the options given below.