The concordance rate for schizophrenia is around percent for monozygotic twins.

50%

Schizophrenia ia an illness that alters the normal function of the human mind. It can cause episodes of psychosis involving hallucinations, delusions, period of reduced expression, motivation and functioning. This can also lead to reduced social functioning, false belief, unclear and confused thinking. People with schizophrenia often avoid family and friends. The exact cause is still unknown but others believe that genetic and environmental factor play a role in the progression of disease. 

The return of the wolf to yellowstone national park will probably affect the bird population to some degree, not significantly. while wolves will hunt birds when necessary, they prefer to hunt larger prey. the bird population will most likely only be affected when hunting is scarce for the wolves. birds of prey will also probably not be affected as much as other birds who spend more time on the ground hunting for food as the tend to spend more time in the air or in trees since they do not need to stay on the ground for long due to the nature of the way they hunt.

Ithink the answer is c. i’m not sure though i’ll notify you when i have an exact answer!