Need help answering these questions please 1.How do the two nostrils provide the brain with slightly different samples of the olfactory environment?

Need help answering these questions please

1.  How do the two nostrils provide the brain with slightly different samples of the olfactory environment? Why might this be advantageous?

2.  Argue that activity in higher visual areas is more closely linked to the percept we experience than are early visual areas, using experimental findings to support your argument.