Answer:
(d). B-cells.
Explanation:
Adaptive immunity can be described as immunity which develops in response to exposure to a pathogen (or foreign molecule). throughout the life. It is divided into two types, humoral immunity and cell-mediated immunity.
Humoral immunity is mediated by B cells that secrete antibodies against particular antigens. These antibodies recognize and neutralize the antigens and activate cell-mediated immunity, which is mediated by T cells.
Thus, the correct answer is option (d).
Answer:
What causes ocean waves? Ocean waves are created by the transfer of energy from the atmosphere to water. Most water waves are generated by wind moving over the water's surface that creates fractional drag. ... The water molecules within deep water trace a series of circles that extend below the surface of the wave base
Explanation:
The answer is going to be C
Answer:
through excess us of corbon(ii)oxide emitting product such as charcoal that cause global warming hence depletion of oxygen in air
Answer:
Endocytosis
Explanation:
Some molecules that are required by a cell are so large that they cannot pass into a cell by either the cell membrane or by any carrier protein. These molecules are transported into the cell by the process named as endocytosis.
In this process, the cell membrane forms a vesicle, a membrane-bound sac, around the large molecule. Then, the vesicle pinches the molecule into the cytoplasm of the cell. Energy is required for this process to occur.
