Answer:
b). activation of T cells
Explanation:
An APC (antigen-presenting cell) can be described as an immune cell, which detects, uptakes, and informs the acquired immune response when an infection takes place. B cells, macrophages, and dendritic cells are antigen-presenting cells.
These cells play an important role in activation of T cells. T cells are unable to recognize soluble or free antigens and can only recognize antigens processed and presented by carrier molecules, such as MHC molecules.
Presence of MHCII molecules is a defining feature of APCs that process and present antigens to T cells. Hence, all antigen-presenting cells help in activation of T cells.
Thus, the correct answer is option (b).
D. They were exposed to the same agents of weathering.
<span>The leaves on a green plant soak up sunlight to make food. A cow's stomach digests grass that was eaten. These are examples of C. metabolism.
</span>Metabolism<span> is the process by which your </span>body<span> converts what you eat and drink into energy.</span><span>
</span>
Anaphase 1 -- a homologous pair is being pulled apart by spindle fibers.
Anaphase 2 -- the spindle fibers attaches to the centromere and pulls 2 pieces of the same chromosome apart.
The difference is significant because the chromosomes are aligned in different directions.
let me know if you need more information.
-- scdssn
