Answer:
Stem cells are simple, unspecialised cells found in animals and plants that have the ability to divide to form cells of the same type. They can also differentiate into a variety of specialised cells. Stem cells can be harvested from embryonic umbilical cord or adult bone marrow.
The type of immunity that provides lifetime immunity for the body against a specific pathogen is called acquired immunity. It is also referred to as adaptive or specific immunity.
Acquired immunity is not present at birth. it is learned. As a person's immune system encounters foreign substances (antigens) the components of acquired immunity learn the best way to attack each antigen and begin to develop a memory for that antigen. Acquired immunity is also called specific immunity because it tailors its attack to a specific antigen previously encountered. Its uniqueness lies in its ability to learn, adapt and remember.
Acquired immunity takes time to develop after first exposure to a new antigen. However afterward, the antigen is remembered, and subsequent responses to that antigen are quicker and more effective than those that occurred after first exposure. Memory of a particular antigen is kept by the B and T lymphocytes.
Hurricanes begin as tropical storms over the warm moist waters of the Atlantic and Pacific Oceans near the equator, usually. As the moisture evaporates it rises until enormous amounts of heated moist air are twisted high in the atmosphere.
Answer:
Fermentation is the process in which a carbohydrate source is converted in the absence of oxygen
Answer:
C. Cytology is the study of cells, while histology is the study of tissues.
Explanation:
