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The main source of organic matter in soil is

What is multicast routing?

In the following question, a sentence has been given in Active/Passive voice. Out of the four alternatives suggested, select the one which best
expresses the same sentence in Passive/Active voice.
Chefs use these machines to mix the ingredients.

A sentence has been given in Direct/Indirect Speech. Out of the four given alternatives, select the one which best expresses the same sentence in Indirect/Direct Speech
 
The lawyer said to them, “Call the witness."

Variation in human skin color is an example of

Who is the author of the book ' Centrestage - Inside the Narendra Modi Model of Governance '

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The antigen-antibody immunological reaction is used to be regarded as typical of immunological responses. Antibodies are proteins synthesized by specialized cells called plasma cells, which are formed by lymphocytes (cells from the lymph system) when an antigen, a substance foreign to an organism's body, comes in contact with lymphocytes. Two important manifestations of antigen-antibody immunity are lysis, the rapid physical rupture of antigenic cells and the liberation of their contents into the surrounding medium, and phagocytosis, a process in which antigenic particles are engulfed by and very often digested by macrophages and polymorphs. The process of lysis is executed by a complex and unstable blood constituent known as complement, which will not work unless it is activated by a specific antibody; the process of phagocytosis is greatly facilitated when the particles to be engulfed are coated by a specific antibody directed against them.

One of the two important manifestations of antigen-antibody immunity is lysis while the other is

In the following question, out of the four alternatives, select the alternative which is the best substitute of the phrase.
lack of skill, ability, or competence