Why was rna the first genetic material and not dna?

It now seems certain that RNA was the first molecule of heredity, so it envolved all the essential methods for storing and expressing genetic imformation before DNA came onto the scene. However, single-stranded RNA is rather unstable and easily damaged by enzymes.

No because the eaeht is on a 23.5 degree axis tilt and so when it is winter the northern hemisphere is pointing away from the sun and the soutubern hemisphere is pointing toward the sun