Which fibrous mineral substance can withstand red-hot temperatures without being damaged?

In bryophytes and pteridophytes,transport of male gametes requires:

$A$ body of mass $m_1 = 4 \ kg$ moves at $5 \hat{i} \ m/s$ and another body of mass $m_2 = 2 \ kg$ moves at $10 \hat{i} \ m/s$. The kinetic energy of the centre of mass is

Which of the following is incorrect with respect to $Chondrichthyes$?

Tracheids differ from other tracheary elements in

$A$ solution of $Na_2SO_4$ in water is electrolysed using inert electrodes. The products at cathode and anode are respectively: