Which period has large formation of coal beds? Write about it.

Write about MPF.

Write about introns?

Write about Atavism.

Write about purines.

Write about ribozyme.

Which period is called age of mammals? Write about it.

Which biome has be climate regulatory role? Write a brief not about it?

Two solid spheres of the same mass are made of metals of different densities. Which of them has a large moment of inertia about the diameter?