B and D.
A respondent behaviour is caused by a stimuli. In this case, it’s the body’s natural instinct to sniff to locate the source of a strange odour or to blush when embarrassed.
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The structures that provides the muscle cells in the heart with a constant supply of oxygen is C . coronary
Answer:
The difference between a mold and a cast fossil are <u><em>a mold fossil is generated when an object is deposited in soft mud and then removed by decomposition or physical forces; a cast fossil is formed when a mold fossil fills up with sediment.</em></u>
Explanation:
Answer:
because precipitation is caused by heat
Explanation:
heat draws water, and the equator is very hot.
Answer:
d) The antigen-presenting cell encounters and processes the antigen.
e) With the antigen, the antigen-presenting cell migrates to the nearest lymph node.
b) The antigen-presenting cell displays the antigen to the T cells.
c) The T cells initiate the immune response if the antigens are viral proteins or abnormal antigens.
a) Infected or malignant cells are then destroyed before they can do further harm to the body.
Explanation:
The antigen-presenting cells (e.g., dendritic cells, macrophages) are cells of the immune system that mediate cellular immune responses by processing and presenting antigens (i.e., peptides components of pathogens) to T lymphocytes. The antigen-presenting cells travel through lymphatic vessels from the site of infection to the lymph nodes where they present antigens to naive T cells, i.e., T cells that have matured but have not yet encountered their corresponding antigens. This presentation facilitates the clonal expansion of T cells that are specific for the antigen which acquire effector functions in order to destroy infected cells. This process is known as immune clearance and is associated with the apoptosis of antigen-specific T cells.
