Answer:
Immune responses to antigens may be categorised as primary or secondary responses. The primary immune response of the body to antigen occurs on the first occasion it is encountered. Depending on the nature of the antigen and the site of entry this response can take up to 14 days to resolve and leads to the generation of memory cells with a high specificity for the inducing antigen. The humoral response, mediated by B cells with the help of T cells, produces high-affinity and antigen-specific antibodies. This is in contrast with the CD8 T-cell response which leads to the generation of large numbers of antigen-specific cells that are capable of directly killing infected cells. Antigen-specific CD4 T cells, which provide help to B cells in the form of cytokines and other stimulatory factors, can also be expanded upon antigenic stimulation.
The secondary response of both B- and T cells is observed following subsequent encounter with the same antigen and is more rapid leading to the activation of previously generated memory cells. This has some quantitative and qualitative differences from the primary response.
Explanation:
GOOD LUCK!
A. Bacteria because plants & animals can't obtain nitrogen directly from the atmosphere.
Answer:
No
Explanation:
The concentratian gradiant of water would be ososis.
Concentrartion gradiant means when an area of high concentration spreads out into an are with low concentration. Osmosis is the concentration gradiant but with water where an area of a high concentration of water spreading into an are of low water concentration.
Answer D is the correct one!
Answer:
the faster the car goes the more stopping distance is needed
Explanation: