Answer:
The correct option is : <u>C. prevent the immune system from responding to self-antigens</u> and <u>D. prevent excessive response to foreign antigens </u>
Explanation:
<u>Immune tolerance</u>, also known as the immunotolerance, of the immune system, is a state of unresponsiveness to the cells or tissues that are capable of eliciting an immune response in an organism.
Tolerance is classified into <u>central and peripheral. </u>The central tolerance is induced in the thymus and bone marrow. Whereas, the peripheral tolerance is induced in the other tissues and the lymph nodes.
<u>Central tolerance of the immune system is responsible for discriminating the self cells from the non-self cells of the body and thus prevents the body from responding to self-antigens.</u>
<u>Peripheral tolerance of the immune system is responsible for preventing excessive response of the immune system to foreign antigens like allergens.</u>
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Answer: A. The collection of a representative sample of a larger population.
Explanation:
The sampling is a process of selecting the units or individuals from the interested population. This process ensures the quantity, and quality. This process ensures the estimation of the characteristics of the whole population. The sampling can also be done in a way that only desired individuals or items are selected this is called as the purposive sampling technique.
According to the given situation, the survey research requires the collection of the large sample size so as to ensure the representative samples of the entire population exhibiting the desired traits.
On 6 March 1957, the Gold Coast (now known as Ghana) gained independence from Britain. Ghana became a member of the Commonwealth of Nations and was led to independence by Kwame Nkrumah who transformed the country into a republic, with himself as president for life.
The Independence Day of Ghana is a national holiday celebrated yearly. This day is an official state holiday for the citizens of Ghana both within and in the diaspora to honour and celebrate the Heroes of Ghana who led the country to attain its independence. The Independence Day is celebrated on March 6 every year.
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The Cubans need for more self government from the Spanish empire.
Answer:
Russia, not Germany, mobilised first. The resulting war, with France and Britain backing Serbia and Russia against two Central Powers, was Russia's desired outcome, not Germany's. Still, none of the powers can escape blame. All five Great Power belligerents, along with Serbia, unleashed Armageddon.
