Answer:
a
Explanation:
After Columbus’ arrival in the Americas, the animal, plant, and bacterial life of these two worlds began to mix. This process, first studied comprehensively by American historian Alfred Crosby, was called the Columbian Exchange. By reuniting formerly biologically distinct land masses, the Columbian Exchange had dramatic and lasting effects on the world. New diseases were introduced to American populations that had no prior experience of them. The results were devastating. These populations also were introduced to new weeds and pests, livestock, and pets. New food and fiber crops were introduced to Eurasia and Africa, improving diets and fomenting trade there. In addition, the Columbian Exchange vastly expanded the scope of production of some popular drugs, bringing the pleasures — and consequences — of coffee, sugar, and tobacco use to many millions of people. The results of this exchange recast the biology of both regions and altered the history of the world.
C, The basis of solution according to Darwinian Theory
Answer:
The region is characterised by widespread poverty, unemployment, food scarcity and insecurity, malnutrition, starvation, inequality, isolation and underdevelopment. The main problems and challenges of development in this province is poverty, lack of employment, illiteracy, inequality, malnutrition and so on.
Answer:
The Central African Republic is a landlocked nation within the interior of the African continent. It is bordered by Cameroon, Chad, Sudan, South Sudan, the Democratic Republic of the Congo, and the Republic of the Congo. The country lies between latitudes 2° and 11°N, and longitudes 14° and 28°E.
Explanation:
Essentially, cancer is a condition caused by unchecked cell division. Its growth and development are typically correlated with a number of modifications in the activity of cell cycle regulators.
What condition causes cells to cycle through the cell cycle uncontrollably?
Cells that divide uncontrolled and invade neighboring tissues are what cause cancer. DNA alterations are the root cause of cancer. Most DNA alterations that cause cancer take place in regions of DNA known as genes. Genetic alterations are another name for these modifications.
This process is tightly regulated to guarantee that the DNA of a dividing cell is accurately duplicated, that any DNA errors are corrected, and that each daughter cell obtains a complete set of chromosomes. Checkpoints, also known as restriction points, are locations in the cell cycle when specific genes can check for issues and stop the cycle for repairs if something is wrong.
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