Many scientists are working to generate organs in vitro. In some cases, cells are seeded onto a "scaffold" shaped like the desired target organ. Such scaffolds are likely composed of extracellular matrix proteins.

Explanation:

Tissue engineering evolved from the biomaterial development field and refers to the practice of combining biologically active scaffolds, cells and molecules to create functional tissues. The goal of tissue engineering is to collect ideas or theories that restore, maintain or improve damaged tissues or entire organs. Skin and artificial cartilage are examples of engineered fabrics that have been approved by the FDA; however, they currently have limited use in human patients.

Regenerative medicine is a broad field that includes tissue engineering, but it also incorporates research on self healing - where the body uses its own systems, sometimes with the help of foreign biological material, to recreate cells and rebuild tissues and organs. The terms "tissue engineering" and "regenerative medicine" have become interchangeable, as the field attempts to focus on cures rather than on treatments for complex and often chronic diseases.

This field continues to evolve. In addition to medical applications, non-therapeutic applications include the use of tissues as biosensors to detect biological or chemical threatening agents, and tissue chips that can be used to test the toxicity of an experimental drug.

the expansion of the rule of empires over other territories took place as a result of several reasons including economic, ethnocentric, political, and religious, and exploratory purposes.

in terms of economic purposes: imperial governments aimed to maximize profits and with that purpose they neeeded cheap labor, access to or control of markets to sell or buy products. they also desired to find natural resources (precious metals and land). in the awake of   industrial revolution, dependent colonies provided the necessary raw materials that european factories and market needed to manufacture products.  

ethnocentric: many territories were conquered by imperial territories in an attempt to spread their cultures, values and belief as they considered them to be superior. in the late 19th century, for example, european powers held   the racist belief that inferior races should be conquered in order to “civilize” them.

political: another reason that drove conquer and expansion was patriotism and growing imperial power. it refers to national prestige, pride, and security. empires sought strategic territory to ensure access for their navies and armies around the world.

religious: the aim of converting new member of other religions was another factor that prompted expansion.   christian missionaries from europe established churches in conquered territories during the nineteenth century. thus, they spread western cultural values. furthermore, the imperial nation’s language was spread as well, through educational and religious interactions.

exploratory: imperial nations or their citizens aimed to explore territory that was unknown to them,   for different purposes including medical or scientific research, however, at the very   beginning, they did it to embark on adventure. furthermore, imperial explorers sought to discover, map, and claim territory before their imperial competition did, for national and personal glory as well as to realize the imperialist goal of expansion.

the answer is expolration. hope this !