Answer:
That statement is true
Explanation:
A strong proof for this statement would be their irrigation system. At that time, the harrapans civilization was among the first society who manage to send water to agricultural fields that located far away from water source. (Advanced architectural and engineering skills are needed for this)
Because of this , they managed to eliminated hunger problems and continuously improve their economic strength due to the large amount of crops they're able to sell.
<span>Politics and culture. </span><span>The Crusades influenced the attitude of the western Church and people towards warfare
</span>
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>
<u />
The answer is B. The Big Bang theory states that the universe began as a small dense ball of matter
Try to search it up on google.
