Why does the earth's sky appear blue during day time?

The sky appear blue due to

Why does sky appear blue?

Why does the colour of the sun appear red during sunset?

Chromosomes appear beaded during

The first seed plants appeared during

Absorption lag appears during

Stomata open during day due to

(a) Why does the old glass object appear slightly milky instead of being transparent? (b) What do you meant by unit cell of crystal lattice?

Why does table salt, some times appear yellow in colour?

The correct sequence of the of the substances appeared during the course of origin of life on earth was: