Seals may have been used to stamp bags or packets containing goods that were sent from one place to another.
After a bag was closed or tied, a layer of wet clay was applied on the knot and the seal was pressed on it. The impression of the seal is known as a sealing.

No, there is no illustration of wheeled vehicles in earlier lessons.

Apart from food, some other things also could have been obtained from the animals like the services of animals such as pulling the carts and carrying goods from one place to another place, skin of animals etc. Animals like ox, buffalo, horse, mule and elephant are in use for carrying goods today.

The beads could have been used for making ornaments and jewelleries.

The advantages of writing on a hard surface are as follow:
(i) The hard surfaces are long-lasting.
(ii) They overcome all chances of destruction from all objects of nature i.e. wind, rain, sun etc.
(iii) They are preserved for future generations to know about our rich past and culture.
(iv) The insects could not eat such materials as they destroyed the manuscripts of the past.
The disadvantages of writing on hard surface are as follow:
(i) It is not easily portable.
(ii) Writing on hard surface is a very difficult task.
(iii) It needs much hard metal to write on the hard surface.
(iv) It requires a lot of time to complete the writing.

The farmers and herders in the earlier period cultivated the fields themselves and domesticated the animals. The farmers and herders who gave food to the Harappan cities knew about agriculture and domestication of animals. So, they supplied food to the city dwellers and they also provided their own food.

Lothal to Mohanjodaro's journey will be done on bullock carts along the dusty roads. My parents will carry food, water and clothes. In Mohanjodaro, I would see:
(i) Citadels
(ii) Big storehouses
(iii)A great tank i.e., the Great Bath
(iv) Wells
(v) Streets with covered drains
(vi) Houses of one or two storeys.

Works of artisans of early period were as follow.
(i) Artisans made advanced stone tools that were polished and had a fine cutting edge.
(ii) Various kinds of decorated pots have been found which were used for storing things.
(iii) This was the beginning of using pots for cooking food, especially grains like rice, wheat and lentils.
(iv) Besides these, people also began weaving clothes, using different kinds of materials, for example cotton.

There were major changes in the climate of the world. Climate became relatively warm than the past. This warm condition led to some major changes:
(i) There was development of grasslands in many areas. As a result, the number of animals, which survived on grass, was increased. These animals were deer, antelope, goat, sheep and cattle.
(ii) This increasing number of animals helped people to start thinking about herding and rearing of these animals. Fishing became important.
(iii) At that time, several grains bearing grasses like wheat, barley, rice grew naturally and men became aware about where these grew and when they ripened. These grains were collected by men, women and children and they started thinking about growing these plants on their own.

People travelled from one part of the sub-continent to another due to the following reasons:
(i) People travelled from one place to another in search of livelihood, to escape from natural disasters like floods or droughts.
(ii) Some people also travelled with the spirit of adventure, to find out the interesting facts and to discover new places.
(iii) Caravans or ships were the means of communication and transportation of food material for the merchants.
(iv) Religious teachers moved from one place to another to deliver their religious teachings to the people.
(v) Travelling emerged as a strong aspect of sharing ideas between the diversities.