<span>The earliest authenticated human remains in South Asia is dated about 30000 years ago. It was composed of Mesolithic rock art where this was located in sites mostly found in Indian subcontinent. These rock arts include the Bhimbetka rock shelters in Madhya Pradesh.</span>
William Harvey,a Britsh scientist ,was responsible for discovering the circulatory system
A gerund is a verbal used as a noun. It ends in -ing.
ur gerund phrase in this sentence is " by preparing "....and it is functioning as the object of the preposition.
