Answer:
Defense against a particular antigen is provided by adaptive immunity which is also called specific immunity. In adaptive immunity immunological memory is created which is used by immune cells to destroy that particular pathogen when it again comes in the body.
Adaptive immunity involves T cells and B cells. T cells generate cell mediated immune response and B cells generate a humoral immune response. These responses by T and B cells are specific to a particular pathogen which results in the killing of the pathogen by their phagocytosis enhanced by antibodies or by direct killing of pathogen.
Therefore adaptive immunity provides defense to the body against a particular pathogen by generating immunological memory.
Answer:
One disadvantage of Keisha's investigation is that Keisha never find out the exact food of the wolves.
Explanation:
During Keisha's investigation, he allows the wolf to go free in order to find out their food so Keisha will never know the specific food of the wolves because in the forest there is a large variety of animals on which the wolves can feed so that's why it is a disadvantage of Keisha's investigation but keeping the wolf in the captivity just like the Kirk will allow him to find out the food preference of wolves very easily.
A chemical messenger is any compound that serves to transmit amessage. A chemical messenger may refer to: Hormone, Long rangechemical messenger. Neurotransmitter, communicates to adjacent cells.
Answer:
Every sensory neuron is a (an) stimuli to the central nervous system, and every motor neuron is a(an) transmitter from the central nervous system.