When did dinosaurs originate?

The primates nearest to humans in the evolutionary line are:

Primates which existed about $15$ million years ago were:
$(I)$ Dryopithecus
$(II)$ Homo habilis
$(III)$ Ramapithecus
$(IV)$ Australopithecus
$(V)$ Homo erectus
$(VI)$ Neanderthal man
Choose the correct option.

During the evolution of man, many changes have taken place in his ancestral characters. Which one of the following is an insignificant change?

Match the following:

Column-$I$	Column-$II$ (Brain Capacity)
$(P)$ Homo erectus	$(a) 1400 \text{ cc}$
$(Q)$ Homo habilis	$(b) 900 \text{ cc}$
$(R)$ Neanderthal Man	$(c) 650-800 \text{ cc}$
$(S)$ Modern Homo sapiens	$(d) 1350 \text{ cc}$

Which is the earliest fossil in the evolutionary history of the horse?