Which statement best describes how a B-cell works?

It produces antigens, which stimulate a fever.
It produces antibodies specific to an antigen.
It produces antigens specific to antibodies.
It produces antibodies, which stimulate a fever.

Aseries of connections of food chain in an ecosystem is called a what

Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction. this is an example of speciation.

Describe how a non-resistant staphylococcus aureus bacterium can produce a bacterium that is resistant to methicillin