Which of the following had huge fearsome dagger-like teeth?

The first prehistoric human who was likely to be the first to use tools was:

Among the following,which is the most recent?

Fossils discovered in Java in $1891$ belonged to

What was the cranial capacity of Java Man (in $cc$)?

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