What are the two parts of an oral drill command?

Preparatory command and command of execution

Explanation:

A drill command is an oral order of a commander or leader. The precision with which personnel execute a movement is affected by the manner in which the commander or leader gives the command. Most drills have two parts: the preparatory command and the command of execution. Neither part is a command by itself, but the parts are termed commands to simplify instruction.

The correct sequence for the development of Hinduism is:

•The Bhagavad Gita was written  

The Bhagavad Gita was written between 400 BCE and 200 CE. The authorship of the Bhagavad Gita is not clear. The credit for The Bhagavad Gita is given to a man named Vyasa.

•The Harappa civilization declined  

Around 1900 BCE it was clear that this civilization was going to disappear, and in 1700 BCE most of the cities were almost empty. Recent examination of human skeletons demonstrated that the end of this civilization saw an increase in violence and infectious diseases

•A rigid caste system developed  

The caste system started taking place during the collapse of the Mughal era and the British colonial regime in India. After the fall of the Mughal era, powerful men associated themselves with kings, priests and ascetics. The British Raj agreed on this development, making caste organization a central mechanism. Between 1860 and 1920, the British separated Indians by caste.

•Society was divided into four varnas

•Brahmins: priests, scholars and teachers.

•Kshatriyas: rulers, warriors and administrators.

•Vaishyas: agriculturalists and merchants.  

•Shudras: laborers and service providers.