Which of the following was not part of the agricultural revolution at the end of the 19th century?
a. barbed wire
b. rotation of crops
c. wind power
d. artificial fertilizer

The right answer is B.

Explanation:

Rotation of crops is a very old farming technique, used already in ancient times in different places such as China or in the Roman Empire. It is not an innovation of the 19th century, unlike the other three things mentioned here.

this isn't a question and if you're going to list things be kind and use commas.

the caste system in india is the paradigmatic ethnographic example of caste. it has origins in ancient india, and was transformed by various ruling elites in medieval, early-modern, and modern india, especially the mughal empire and the british raj.it is today the basis of educational and job reservations in india.it consists of two different concepts, varna and jati, which may be regarded as different levels of analysis of this system.

the caste system as it exists today is thought to be the result of developments during the collapse of the mughal era and the british colonial regime in india. the collapse of the mughal era saw the rise of powerful men who associated themselves with kings, priests and ascetics, affirming the regal and martial form of the caste ideal, and it also reshaped many apparently casteless social groups into differentiated caste communities.the british raj furthered this development, making rigid caste organisation a central mechanism of administration

i didn’t fully understand your question but i hope this you !