Answer:
b. agricultural revolution
Explanation:
Agricultural revolution spanned across different time frames. The first agricultural revolution happened in the Neolithic era
H
The Agricultural Revolution featured a significant rise in production of agricultural production because of an increase in labor and land availability in the 17th century. This agricultural revolution took place over different periods of time
The Norfolk four-course rotation was an important innovation that aided the Agricultural Revolution as it increased yield in the farm by enhancing quality of the soil through the practise of crop rotation.
This type of rotation helped to restore fertility of the soil and increase nutrients.
Answer:
Tunneling nanotubes.
Explanation:
Tunneling nanotubes refer to certain very thin and elongated tubules that emerge from the membrane of a cell and allows it to connect and communicate with other neighboring cells over relatively long distances. Because of their very small size, tunneling nanotubes were only discovered until 1999, and their role in cell communication is still not fully understood. It is known that they're capable of transmitting and conducting cell-surface proteins, cytoplasmic vesicles and calcium signals between cells. However, they can also act as vectors for viruses such as HIV.
The idea of being at the "bottom" is one derived from the concept of social hierarchy. In a social hierarchy, certain groups in society are considered valuable and admired (at the top) while others are often ignored, abused, or rejected (at the bottom). In our society, this is usually related to the socio-economic position an individual has. Therefore, people at the "bottom" can often feel "invisible." They feel that the government, as well as social institutions, care little about their interests and needs.
Tammy Crabtree can be seen as an example of this. She is likely to feel invisible, as very few people care about her plight. She works far from her house, for a very low wage, and feels unable to improve her future.
Answer:
A desert is a barren area of landscape where little precipitation occurs and, consequently, living conditions are hostile for plant and animal life. The lack of vegetation exposes the unprotected surface of the ground to the processes of denudation. About one-third of the land surface of the world is arid or semi-arid. This includes much of the polar regions, where little precipitation occurs, and which are sometimes called polar deserts or "cold deserts". Deserts can be classified by the amount of precipitation that falls, by the temperature that prevails, by the causes of desertification or by their geographical location
