Answer:
Vaccination involves showing the immune system something which looks very similar to a particular virus or bacteria, which helps the immune system be stronger when it is fighting against the real infection.
Explanation: "it is what it is".
The two types of succession are primary and secondary. <span> Primary succession is the series of changes that occur on an entirely new habitat which has never been colonized before, while secondary occurs on places that have already been colonized before.</span>
The autoimmune disease causes joint swell and stiff.
The correct answer is option b.
One way by which wetland controls flood is by absorbing water from rivers. Wetland absorbs water and and store it. Afterwards it releases slowly.It behaves like a sponge. It also protects nearby houses flooding and vegetation too.It reduces the water flow and settles down the sediments and pollutants also.
