Question

Which of
The
following
is required for C1
activation​

Answer 1

Answer:

Sorry but

There are no options sis/bro

Answer 2

Answer:

The antibodies IgM or certain subclasses of IgG complexed with antigens are able to initiate the complement system: a single pentameric IgM can initiate the pathway, while several monomeric IgG molecules are needed. ... Active C1r cleaves the C1s molecules, activating them.