To separate the pebbles you should hand pick it,
meaning-from the word itself, you don’t have to use any kind of instrument but
your hand.
On the other hand, to separate the mud you can use
decantation or sedimentation or filtration.
To separate the husk you have to use sieving.
The adaptive (specific) defense system: issues an attack specific to particular foreign substances. hence, option A is correct.
<h3>What is the adaptive immune system's primary function?</h3>
Adaptive immune responses are designed to eliminate invading infections and any harmful chemicals they create. Because these responses are harmful, they must only be elicited in response to molecules that are foreign to the host, not the host's own molecules.
Antibodies and lymphocytes make up the adaptive defense, which is also known as the humoral and cell-mediated responses. The term 'adaptive' alludes to the distinction between self and non-self, as well as the tailoring of a response to a specific foreign invader.
Learn more about adaptive immune system here:
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A. Almost all genes in microorganisms, plants, and animals have the same corona
