Taxonomic studies depends on (a) Ecological information of organisms. (b) Structure of cell and development process of organisms. (c) External and internal structure of organisms. (d) All of the above.
The ozone layer protects the Earth against most UVB coming from the sun. It is always important to protect oneself against UVB, even in the absence of ozone depletion, by wearing hats, sunglasses, and sunscreen.
