What causes asthma?
a. bacteria that are resistant to antibiotics infect the body.
b. particular antigens trigger muscle contractions that make it difficult to breathe.
c. antibodies and cytotoxic t cells attack cells in the tissues of the lungs.
d. mosquito-borne pathogens enter the bloodstream.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

the unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.

i think the answer is b.

1. what is the relationship between the shape of an enzyme and the reactions they catalyze?

2. how does an enzyme inhibitor work?

separate your answers so i dont get confused : )